RME Audio Hammerfall HDSP 9652 User Manual

Download

Page 1

User's Guide

Hammerfall® DSP System

HDSP 9652

PCI Busmaster Digital I/O System

2 + 24 Channels SPDIF / ADAT Interface

24 Bit / 96 kHz Digital Audio

ADAT Sync In

2 x MIDI I/O

TotalMix

™

24 Bit / 96 kHz 9

SyncAlign

ZLM® SyncCheck®

Page 2

User's Guide HDSP System HDSP 9652 © RME

General

1 Introduction ...............................................................6

2 Package Contents.....................................................6

3 System Requirements ..............................................6

4 Brief Description and Characteristics.....................6

5 Hardware Installation................................................7

6 Hardware – Connectors

6.1 External Connectors ..............................................7

6.2 Internal Connectors................................................8

7 Accessories...............................................................9

8 Warranty.....................................................................9

9 Appendix....................................................................9

Driver Installation and Operation - Windows

10 Driver and Firmware

10.1 Driver Installation .................................................12

10.2 Driver Update.......................................................12

10.3 De-Installing the Drivers.......................................13

10.4 Firmware Update..................................................13

11 Configuring the HDSP 9652

11.1 Settings Dialog.....................................................14

11.2 Clock Modes – Synchronization...........................16

12 Operation and Usage

12.1 Playback...............................................................18

12.2 DVD Playback (AC-3 / DTS)................................19

12.3 Notes on WDM.....................................................20

12.4 Channel Count under WDM.................................20

12.5 Multi-client Operation ...........................................21

12.6 Digital Recording..................................................22

13 Operation under ASIO

13.1 General ................................................................23

13.2 Channel Count under ASIO .................................23

13.3 Known Problems..................................................24

13.4 Synchronization – ADAT Sync.............................24

14 Operation under GSIF.............................................25

15 Using more than one Hammerfall DSP .................25

16 DIGICheck................................................................26

17 Hotline – Troubleshooting

17.1 General ................................................................27

17.2 Installation............................................................28

Page 3

User's Guide HDSP System HDSP 9652 © RME

Driver Installation and Operation - Mac OS X

18 Driver and Flash Update

19.1 Driver Installation.................................................30

19.2 Driver Update.......................................................30

19.3 Flash Update........................................................30

19 Configuring the HDSP 9652

20.1 Settings Dialog.....................................................31

20.2 Clock Modes – Synchronization..........................33

20 Mac OS X FAQ

21.1 Round about Driver Installation...........................35

21.2 MIDI doesn't work ................................................35

21.3 Supported Sample Rates.....................................36

21.4 Channel Count under Core Audio .......................36

21.5 Repairing Disk Permissions.................................36

21.6 PCI Compatibility .................................................36

21.7 Various Information..............................................37

21 Hotline – Troubleshooting .....................................37

Connections and TotalMix

22 Digital Connections

24.1 ADAT ...................................................................40

24.2 SPDIF...................................................................40

24.3 Word Clock...........................................................41

24.4 MIDI......................................................................41

23 Word Clock

25.1 Technical Description and Background...............42

25.2 Cables and Termination.......................................42

25.3 General Operation................................................43

24 TotalMix: Routing and Monitoring

26.1 Overview..............................................................44

26.2 The User Interface...............................................46

26.3 Elements of a Channel ........................................47

26.4 Tour de TotalMix..................................................47

26.5 Submix View ........................................................49

26.6 Mute and Solo......................................................49

26.7 Quick Access Panel.............................................50

26.8 Presets.................................................................50

26.9 Monitor Panel.......................................................52

26.10 Preferences........................................................52

26.11 Editing the Names..............................................53

26.12 Hotkeys..............................................................54

26.13 Menu Options.....................................................55

26.14 Level Meter ........................................................56

Page 4

User's Guide HDSP System HDSP 9652 © RME

25 TotalMix: The Matrix

27.1 Overview..............................................................57

27.2 Elements of the Matrix View ................................57

27.3 Usage...................................................................57

27.4 Advantages of the Matrix.....................................58

26 TotalMix Super-Features

28.1 ASIO Direct Monitoring (Windows only) ..............58

28.2 Selection and Group based Operation ................59

28.3 Copy Routings to other Channels........................59

28.4 Delete Routings....................................................59

28.5 Recording a Subgroup (Loopback)......................60

28.6 Using external Effects Devices............................61

27 TotalMix MIDI Remote Control

29.1 Overview..............................................................62

29.2 Mapping ...............................................................62

29.3 Setup....................................................................63

29.4 Operation .............................................................63

29.5 Simple MIDI Control.............................................64

29.6 Loopback Detection.............................................65

Technical Reference

28 Tech Info ..................................................................68

29 Technical Specifications

31.1 Digital Inputs ........................................................69

31.2 Digital Outputs......................................................69

31.3 Digital...................................................................70

31.4 MIDI......................................................................70

30 Technical Background

32.1 Lock and SyncCheck...........................................71

32.2 Latency and Monitoring........................................72

32.3 DS – Double Speed .............................................73

32.4 AES/EBU – SPDIF...............................................74

31 Block Diagram HDSP 9652.....................................75

Page 5

User's Guide HDSP System HDSP 9652 © RME

User's Guide

HDSP 9652

General

Page 6

User's Guide HDSP System HDSP 9652 © RME

1. Introduction

Thank you for choosing the RME Hammerfall DSP system. This unique audio system is capable of transferring analog and digital audio data directly to a computer from practically any device. The latest Plug and Play technology guarantees a simple installation, even for the inexperienced user. The numerous unique features and well thought-out configuration dialog puts the Hammerfall DSP

at the very top of the range of computer-based audio interfaces.

The package contains drivers for Windows XP / Vista / 7 and Mac OS X PPC. RME's high-performance philosophy guarantees maximum system performance by executing

as many functions as possible not in the driver (i.e. the CPU), but directly within the audio hardware.

2. Package Contents

Please check your HDSP 9652 package to include each of the following:

• HDSP 9652 PCI card

• HDSP 9652 expansion board

• Quick Info guide

• RME Driver CD

• Adapter cable (D-type to D-type/phono)

• MIDI breakout cable

• Internal cable (2-core)

• Flat ribbon cable (14-conductor)

• 2 optical cable (TOSLINK), 2 m (6.6 ft)

3. System Requirements

• Windows XP or higher, Mac OS X (10.4.8 or higher)

• PCI Interface: a free PCI rev. 2.1 Busmaster slot

4. Brief Description and Characteristics

• All settings can be changed in real-time

• Analog, ADAT and SPDIF I/Os can be used simultaneously

• 8 available buffer sizes/latencies: 0.7 / 1.5 / 3 / 6 / 12 / 23 / 46 / 93 ms

• 12 channels 96 kHz/24 bit record/playback via ADAT optical (S/MUX)

• Clock modes slave and master

• Automatic and intelligent master/slave clock control

• Unsurpassed Bitclock PLL (audio synchronization) in ADAT mode

• Word clock input and output

• ADAT Sync In (9-pin D-sub) for sample-accurate transfers

• Zero Latency Monitoring for latency-free submixes and perfect ASIO Direct Monitoring

• SyncAlign guarantees sample aligned and never swapping channels

• SyncCheck tests and reports the synchronization status of input signals

• 2 x MIDI I/O, 16 channels high-speed MIDI

• DIGICheck DSP: Level meter in hardware, peak- and RMS calculation

• TotalMix: 1352 channel mixer with 40 bit internal resolution

Page 7

User's Guide HDSP System HDSP 9652 © RME

5. Hardware Installation

Before installing the PCI card, please make sure the computer is switched off and the power cable is disconnected from the mains supply. Inserting or removing a PCI card while the computer is in operation can cause irreparable damage to both motherboard and card!

1. Disconnect the power cord and all other cables from the computer.

2. Remove the computer's housing. Further information on how to do this can be obtained from your computer’s instruction manual.

3. Important: Before removing the card from its protective bag, discharge any static in your body by touching the metal chassis of the PC.

4. Connect the HDSP 9652 card with the Expansion Board using the supplied flat ribbon cable. Note: The connectors on the cable cannot be plugged in the wrong way round.

5. Insert the PCI card firmly into a free PCI slot, press and fasten the screw.

6. Insert the Expansion Board and fasten the screw.

7. Replace the computer's housing.

8. Reconnect all cables including the power cord.

6. Hardware - Connectors

6.1 External Connectors

HDSP 9652 consists of the main PCI board and an Expansion Board. All the essential elec- tronics are located on the PCI card, so it will also work without the Expansion Board.

The main board's bracket has two ADAT optical inputs and outputs, as well as a 9-pin D-type socket. Coaxial SPDIF input and output are realized by the included breakout cable, whereby the red phono socket is the output.

The ADAT1 I/O next to the D-type socket can also be used as optical SPDIF I/O, if set up accordingly in the Settings dialog.

The coaxial SPDIF I/O (RCA) is fully AES/EBU compatible by transformer-coupling and level adjustment. The HDSP 9652 accepts the commonly used digital audio formats, SPDIF as well as AES/EBU.

ADAT Sync In for connection to ADAT Sync of an ADAT recorder. Allows for sample-accurate synchronization with ASIO 2.0.

The Expansion Board's bracket gives access to a third ADAT optical input and output as well as word clock input and output. Next to the two BNC sockets a LED displays the word clock input lock status.

Page 8

User's Guide HDSP System HDSP 9652 © RME

Word Clock I/O (BNC). When shipped, the word clock input is not terminated. Termination with 75 Ohm is available via jumper X105 on the Expansion Board.

The included MIDI breakout cable is connected to the 9-pin Mini-DIN connector, providing two MIDI inputs and outputs.

Note

: If neither Word Clock I/O, MIDI I/O, nor a third ADAT I/O is required, it is not necessary to

install the Expansion Board at all.

6.2 Internal Connectors

AEB1 IN / CD IN

This internal digital input can be used with both SPDIF and ADAT.

SPDIF

• Connection to an internal CD-ROM drive with digital audio output. Allows for a direct transfer of digital audio data within the computer.

• Connection to SYNC OUT of another card. This internal SPDIF connection can be used to synchronize multiple cards with sample accuracy, and without the need for an external connection. The card of which SYNC OUT is used will be master, the SYNC IN one will be slave. SPDIF In / Internal has to be selected in the Settings dialog. Additionally Pref. Sync Ref has to be set to SPDIF In for this internal connection to work properly. Please note that the external SPDIF or AES input can no longer be used.

ADAT

• Connection to a TEB (TDIF Expansion Board). The highest sample rate is 96 kHz, the 4channel Double Wire mode (S/MUX) is automatically activated in Double Speed mode. Select AEB / ADAT Int. in the Settings dialog.

• Connection to an AEB4-I or AEB8-I. When using these (no longer available) Expansion Boards ST7 must also be connected to the Expansion Board. The highest sample rate is 48 kHz. Select AEB / ADAT Int. in the Settings dialog. In this mode, the optical input can still be used as optical SPDIF input.

AEB2 IN

Jumper ST5 allows to connect a second AEBx-I. Remove the jumper (factory default position ADAT2 IN), and connect the 2-core cable of the AEBx-I to position ’AEB2 IN’. Please note the label GND for correct polarity. In this mode the optical input ADAT2 can’t be used anymore.

ADAT 1 OUT

This internal ADAT output carries the same audio data as the optical output ADAT1 in ADAT mode. Connecting an AEB4-O or AEB8-O, the highest sample rate is 48 kHz. Connecting a TEB the highest sample rate is 96 kHz, the 4-channel Double Wire mode (S/MUX) is automatically activated. The internal ADAT output stays active, even when the optical output is switched into SPDIF operation. Please note the label GND for correct polarity.

ADAT 2 OUT

This internal ADAT output carries the same audio data as the optical output ADAT2. See ADAT 1 OUT for details. Both ports can be used to operate one AEBx-O each, for a maximum of 16 analog outputs.

SYNC OUT

This internal SPDIF output carries the same audio data as the external phono output. It can be used to synchronize multiple cards, see above. Please note the label GND for correct polarity.

14-pin connector for the Expansion Board connection using flat ribbon cable. The connectors SYNC1, SYNC2, ST9 and X4 have no functionality.

Page 9

User's Guide HDSP System HDSP 9652 © RME

7. Accessories

RME offers several optional accessories. Also parts of the HDSP 9652 are available separately.

Part Number Description

36003 Optical cable, TOSLINK, 0.5 m (1.6 ft) 36004 Optical cable, TOSLINK, 1 m (3.3 ft) 36006 Optical cable, TOSLINK, 2 m (6.6 ft) 36007 Optical cable, TOSLINK, 3 m (9.9 ft) 36008 Optical cable, TOSLINK, 5 m (16.4 ft) 36009 Optical cable, TOSLINK, 10 m (33 ft)

Standard lightpipe with TOSLINK connectors, RME approved quality. BO9652 Breakout cable SPDIF/ADAT Sync

BOHDSP9652 Breakout cable MIDI VKHDSP9652 Internal flat cable 14-core

8. Warranty

Each individual Hammerfall DSP undergoes comprehensive quality control and a complete test at RME before shipping. The usage of high grade components allows us to offer a full two year warranty. We accept a copy of the sales receipt as valid warranty legitimation.

If you suspect that your product is faulty, please contact your local retailer. The warranty does not cover damage caused by improper installation or maltreatment - replacement or repair in such cases can only be carried out at the owner’s expense.

RME does not accept claims for damages of any kind, especially consequential damage. Liability is limited to the value of the Hammerfall DSP. The general terms of business drawn up by Audio AG apply at all times.

9. Appendix

RME news, driver updates and further product information are available on our website: http://www.rme-audio.com Distributor:

Audio AG, Am Pfanderling 60, D-85778 Haimhausen, Tel.: (49) 08133 / 9181-70 Manufacturer:

IMM Elektronik GmbH, Leipziger Strasse 32, D-09648 Mittweida

Trademarks

All trademarks, registered or otherwise, are the property of their respective owners. RME, DIGICheck and Hammerfall are registered trademarks of RME Intelligent Audio Solutions. HDSP 9652, TMS, DIGI96, SyncAlign, ZLM, SyncCheck and TotalMix are trademarks of RME Intelligent Audio Solutions. Alesis and ADAT are registered trademarks of Alesis Corp. ADAT optical is a trademark of Alesis Corp. Microsoft, Windows 2000, Windows XP, Windows Vista and Windows 7 are registered trademarks or trademarks of Microsoft Corp. Steinberg, Cubase and VST are registered trademarks of Steinberg Media Technologies GmbH. ASIO is a trademark of Steinberg Media Technologies GmbH.

Page 10

User's Guide HDSP System HDSP 9652 © RME

Although the contents of this User’s Guide have been thoroughly checked for errors, RME can not guarantee that it is correct throughout. RME does not accept responsibility for any misleading or incorrect information within this guide. Lending or copying any part of the guide or the RME Driver CD, or any commercial exploitation of these media without express written permission from RME Intelligent Audio Solutions is prohibited. RME reserves the right to change specifications at any time without notice.

CE / FCC Compliance

This device has been tested and found to comply with the limits of the European Council Directive on the approximation of the laws of the member states relating to electromagnetic compatibility according to RL89/336/EWG and RL73/23/EWG.

FCC

This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

- Reorient or relocate the receiving antenna.

- Increase the separation between the equipment and receiver.

- Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.

- Consult the dealer or an experienced radio/TV technician for help.

RoHS

This product has been soldered lead-free and fulfils the requirements of the RoHS directive.

ISO 9001

This product has been manufactured under ISO 9001 quality management. The manufacturer, IMM Elektronik GmbH, is also certified for ISO 14001 (Environment) and ISO 13485 (medical devices).

Note on Disposal

According to the guide line RL2002/96/EG (WEEE – Directive on Waste Electrical and Electronic Equipment), valid for all european countries, this product has to be recycled at the end of its lifetime.

In case a disposal of electronic waste is not possible, the recycling can also be done by IMM Elektronik GmbH, the manufacturer of the HDSP MADI.

For this the device has to be sent free to the door to: IMM Elektronik GmbH

Leipziger Straße 32 D-09648 Mittweida Germany

Shipments not prepaid will be rejected and returned on the original sender's costs.

Page 11

User's Guide HDSP System HDSP 9652 © RME

User's Guide

HDSP 9652

Driver Installation and Operation - Windows

Page 12

User's Guide HDSP System HDSP 9652 © RME

10. Driver and Firmware

10.1 Driver Installation

After the PCI card has been installed correctly (see 5. Hardware Installation), and the computer has been switched on, Windows will recognize the new hardware component and start its ‘Hardware Wizard’. Insert the RME Driver CD into your CD-ROM drive, and follow further instructions which appear on your computer screen. The driver files are located in the directory \WDM on the RME Driver CD.

Windows will install the Hammerfall DSP System driver, and will register the card in the system as a new audio device. After a reboot the HDSP 9652 is ready for use.

In case the warning messages 'Digital signature not found', 'Do not install driver', 'not certified driver' or similar come up: simply ignore them and continue with the installation.

In case the Hardware Wizard does not show up automatically after installation of the card, do not attempt to install the drivers manually! An installation of drivers for non-recognized hardware will cause a blue screen when booting Windows!

In Windows 7 Microsoft removed the automatic start of the Driver Software Update dialog. Therefore this dialog has to be started manually after the failed driver installation. Hit the Win key, type 'Device Manager', start the Device Manager by selecting it from the list and hit Enter.

The device is shown with a yellow warning symbol. Usually it is already found in the correct category, Sound, Video and Game Controller (Plug & Play detects a multimedia device). Right click on the device and select 'Update Driver Software' from the context menu.

The dialog Update Driver Software appears. Now follow the instructions given below.

10.2 Driver Update

When facing problems with the automatic driver update, the user-driven way of driver installation will work.

Under >Control Panel /System /Device Manager /Sound, Video and Game Controllers /RME HDSP 9652 /Properties /Driver< you'll find the 'Update Driver' button.

XP: Select 'Install from a list or specific location (advanced)', click 'Next', select 'Don't search I will choose the driver to install', click 'Next', then 'Have Disk'. Now point to the

driver update's directory.

Vista/7: Select 'Browse my computer for driver software', then 'Let me pick from a list of device drivers from my computer', then 'Have Disk'. Now point to the driver update's direc-

tory. This method also allows for the installation of older drivers than the currently installed ones.

Page 13

User's Guide HDSP System HDSP 9652 © RME

10.3 De-Installing the Drivers

A de-installation of the HDSP driver files is not necessary – and not supported by Windows anyway. Thanks to full Plug & Play support, the driver files will not be loaded after the hardware has been removed. If desired these files can then be deleted manually.

Unfortunately Windows Plug & Play methods do not cover the additional autorun entries of TotalMix, the Settings dialog, and the registration of the ASIO driver. Those entries can be removed from the registry through a software de-installation request. This request can be found (like all de-installation entries) in Control Panel, Software. Click on the entry 'RME Hammerfall DSP (WDM)'.

10.4 Firmware Update

The Flash Update Tool updates HDSP PCI cards to the latest version. It requires an already installed driver.

Start the program hdsp_wdm_fut.exe. The Flash Update Tool displays the current revision of the HDSP 9652 and whether it needs an update or not. If so, then please press the 'Update' button. A progress bar will indicate when the flash process is finished. The bar moves slowly first (program), then faster (verify).

If more than one interface card is installed, all cards can be flashed by changing to the next tab and repeating the process.

After the update the PCI card needs to be reset. This is done by powering down and shutting off the PC. A warm boot is not enough!

When the update fails (status: failure), the card's second BIOS will be used from the next cold boot on (Secure BIOS Technology). Therefore the card stays fully functional. The flash process should then be tried again on a different computer.

Note

: Because of the changed hardware revision, Windows might start the hardware assistant and wants to install new drivers. Do NOT let Windows search for new drivers, but follow the instructions given in chapter 10.2.

Page 14

User's Guide HDSP System HDSP 9652 © RME

11. Configuring the HDSP 9652

11.1 Settings Dialog

Configuration of the HDSP 9652 is done via its own settings dialog. The panel 'Settings' can be opened:

• by clicking on the hammer symbol in the Task Bar's system tray The mixer of the Hammerfall DSP system (TotalMix) can be opened:

• by clicking on the mixer icon in the Task Bar's system tray The hardware of the HDSP system offers a number of helpful, well thought-of practical functions

and options which affect how the card operates - it can be configured to suit many different requirements. The following is available in the 'Settings' dialog:

• Input selection

• Operation of the output

• Configuration of digital I/Os

• Synchronization behaviour

• State of input and output

• The latency

Any changes made in the Settings dialog are applied immediately - confirmation (e.g. by clicking on OK or exiting the dialog) is not required. However, settings should not be changed during playback or record if it can be avoided, as this can cause unwanted noises. Also, please note that even in 'Stop' mode, several programs keep the recording and playback devices open, which means that any new settings might not be applied immediately.

The status displays at the bottom of the dialog box give the user precise information about the current status of the system (Master/Slave, sample rate), and the status of all digital input signals.

WDM

Check Input verifies the current digital input signal against the settings in the record program. Activated Windows will automatically (and without notice) perform a sample rate conversion. Deactivated the recording will simply be performed with the wrong sample rate, with a detuned playback later on. This setting is valid for WDM only, it does not apply to ASIO.

SyncAlign guarantees synchronous channels when using WDM multitrack software. This option should only be switched off in case the used software does not work correctly with SyncAlign activated.

With Interleaved activated, WDM devices can be used as 8-channel devices (see chapter 12.5).

Buffer Size

The setting Buffer Size determines the latency between incoming and outgoing ASIO and GSIF data, as well as affecting system stability (see chapter 13/14).

SyncCheck SyncCheck indicates whether there is a valid signal (Lock, No Lock) for each input (Word Clock, ADAT 1-3, SPDIF, ADAT Sync), or if there is a valid and synchronous signal (Sync). The AutoSync Ref(erence) display shows the input and frequency of the current sync source.

Page 15

User's Guide HDSP System HDSP 9652 © RME

Options

AEB activates the internal connector as ADAT1 input instead of the optical TOSLINK. An expansion board (AEB4-I, AEB8-I, TEB) can be connected here.

TMS activates the transmission of Channel Status data and Track Marker information for the SPDIF input.

WDM Devices

Not before Vista the OS had been capable to handle more than 32 WDM stereo devices. Therefore under W2k/XP it often makes sense to intentionally limit their number.

SPDIF In

Defines the input for the SPDIF signal. 'Coaxial' relates to the RCA socket, 'Optical' to the optical TOSLINK input ADAT1, 'Internal' to the jumper 'AEB1 In/CD In'.

SPDIF Out

The SPDIF output signal is constantly available at the phono plug. After selecting 'ADAT1' it is also routed to the optical TOSLINK output ADAT1. For further details about the settings ‘Professional’, ‘Emphasis’ and ‘Non-Audio’, please refer to chapter 22.2.

SPDIF Freq.

Displays the sample rate of the signal at the SPDIF input.

Time Code

Shows the time code from the input ADAT Sync.

Word Clock Out

The word clock output signal usually equals the current sample rate. Selecting Single Speed causes the output signal to always stay within the range of 32 kHz to 48 kHz. So at 96 kHz sample rate, the output word clock is 48 kHz.

Clock Mode

The unit can be configured to use its internal clock source (Master), or the clock source predefined via Pref. Sync Ref (AutoSync).

Pref. Sync Ref.

Used to pre-select the desired clock source. If the selected source isn't available, the unit will change to the next available one. The current clock source and sample rate is displayed in the AutoSync Ref display.

The automatic clock selection checks and changes between the clock sources Word Clock, ADAT, ADAT Sync and SPDIF.

System Clock

Shows the current clock state of the HDSP system. The system is either Master (using its own clock) or Slave (see AutoSync Ref).

Page 16

User's Guide HDSP System HDSP 9652 © RME

About

This tab includes information about the driver and the card’s firmware version. Lock Registry uses a password to prevent changes of the settings stored in the registry. All

settings are still changeable temporarily. As the settings are always loaded from the registry when starting the computer, this method provides an easy way to define a specific initial state of the HDSP system.

11.2 Clock Modes - Synchronisation

In the digital world, all devices are either the ‘Master’ (clock source) or a ‘Slave’ synchronized to the master. If several digital devices are to be used simultaneously in a system, they not only have to operate with the same sample frequency but also be synchronous with each other. This is why digital systems always need a single device defined as ‘master’, which sends the same clock signal to all the other (‘slave’) devices.

Remember that a digital system can only have one master! If the HDSP’s clock mode is set to 'Master', all other devices must be set to ‘Slave’.

The Hammerfall DSP’s intelligent clock control is very user-friendly, being able to switch between clock modes automatically. Selecting AutoSync will activate this mode.

AutoSync guarantees that normal record and record-while-play will always work correctly. In certain cases however, e.g. when the inputs and outputs of a DAT machine are connected directly to the Hammerfall DSP, AutoSync may cause feedback in the digital carrier, so synchronization breaks down. To remedy this, switch the HDSP’s clock mode over to 'Master'.

The HDSP 9652’s ADAT optical input and the SPDIF input operate simultaneously. As there is no input selector, the HDSP has to be told which of the signals is the sync reference (a digital device can only be clocked from a single source). This is why the system has been equipped with automatic clock source selection, which adopts the first available input with a valid digital signal as the clock reference input. The input currently used as sync reference is shown in the AutoSync Ref status field, together with its sample frequency.

Via Pref. Sync Ref (preferred synchronization reference) a preferred input can be defined. As long as the card sees a valid signal there, this input will be designated as the sync source, otherwise the other inputs will be scanned in turn. If none of the inputs are receiving a valid signal, the card automatically switches clock mode to ‘Master’.

Page 17

User's Guide HDSP System HDSP 9652 © RME

To cope with some situations which may arise in studio practice, setting ‘Pref Sync Ref’ is essential. One example: An ADAT recorder is connected to the ADAT1 input (ADAT1 immediately becomes the sync source) and a CD player is connected to the SPDIF input. Try recording a few samples from the CD and you will be disappointed. Few CD players can be synchronized. The samples will inevitably be corrupted, because the signal from the CD player is read with the (wrong) clock from the ADAT i.e. out of sync. In this case, 'Pref Sync Ref' should be temporarily set to SPDIF.

RME’s exclusive SyncCheck technology (first implemented in the Hammerfall) enables an easy to use check and display of the current clock status. The ‘SyncCheck’ field indicates whether no signal (‘No Lock’), a valid signal (‘Lock’) or a valid and synchronous signal (‘Sync’) is present at each of the digital clock source inputs. The ‘AutoSync Ref’ display shows the current sync source and the measured frequency.

In practice, SyncCheck provides the user with an easy way of checking whether all digital devices connected to the system are properly configured. With SyncCheck, finally anyone can master this common source of error, previously one of the most complex issues in the digital studio world.

An example to illustrate this: The ADAT1 and ADAT2 inputs are receiving signals from a digital mixing desk that has been set to clock mode 'Internal' or 'Master'. An ADAT recorder is connected to input ADAT3. The Hammerfall DSP is set to AutoSync mode. As expected, SyncCheck shows that the ADAT1 and ADAT2 inputs are in sync (as they are driven by the same clock from the mixing desk), but shows ‘Lock’ instead of 'Sync' for the input ADAT3. Because the ADAT recorder is not receiving any signal from HDSP or from the mixer, it will generate its own clock at a rate which is (almost) the same as the sample frequency of the mixing desk - but not identical.

Remedy: To drive the ADAT recorder from its digital input, set it to slave mode (DIG), and connect the input to the HDSP’s ADAT3 output. The Hammerfall DSP is already in sync with the mixing desk, so it will send an identical (synchronous) signal to ADAT3 out. The ADAT recorder will lock onto this, its output will also be in sync. The signal from the ADAT recorder is now fully in sync with the signals from the mixing desk.

At 88.2 or 96 kHz: If one of the ADAT inputs has been selected in ‘Pref Sync Ref’, the sample frequency shown in the field SPDIF Freq. differs from the one shown in ‘AutoSync Ref’. The card automatically switches to S/MUX mode here, because ADAT optical inputs and outputs are only specified up to 48 kHz. Data from/to a single input/output is spread over two channels, the internal frequency stays at 44.1 or 48 kHz. In such cases, the ADAT sample frequency is only half the SPDIF frequency.

Page 18

User's Guide HDSP System HDSP 9652 © RME

12. Operation and Usage

12.1 Playback

The HDSP system can play back audio data only in supported modes (channels, PCM) and formats (sample rate, bit resolution). Otherwise an error message appears (for example at 22 kHz and 8 bit).

In the audio application being used, HDSP must be selected as output device. This can often be found in the Options, Preferences or Settings menus under Playback Device, Audio Devices, Audio etc.

We strongly recommend switching off all system sounds (via >Control Panel /Sounds<). Also HDSP should not be the Preferred Device for playback, as this could cause loss of synchronization and unwanted noises. If you feel you cannot do without system sounds, you should consider buying a cheap Blaster clone and select this as Preferred Device in >Control Panel /Multimedia /Audio<.

The screenshot shows a typical configuration dialog of a (stereo) wave editor. After selecting a device, audio data is sent to either an ADAT or SPDIF port, depending on which has been selected as playback device.

Increasing the number and/or size of audio buffers may prevent the audio signal from breaking up, but also increases latency i.e. output is delayed. For synchronized playback of audio and MIDI (or similar), be sure to activate the checkbox ‘Get position from audio driver’.

The HDSP system’s ADAT optical interface allows sample rates of up to 96 kHz using a standard ADAT recorder. Single-channel data at this frequency requires two ADAT channels, achieved using the Sample Multiplexing technique. This reduces the number of available ADAT channels from 8 to 4 per ADAT port.

Note on Windows Vista/7

: Since Vista the audio application can no longer control the sample rate under WDM. Instead the user has to work himself through numerous settings, and to set the sample rate to the exact same value per stereo device.

Page 19

User's Guide HDSP System HDSP 9652 © RME

12.2 DVD-Playback (AC-3/DTS)

AC-3 / DTS

When using popular DVD software players like WinDVD and PowerDVD, their audio data stream can be sent to any AC-3/DTS capable receiver via the 9652’s AES and SPDIF output. For this to work an output wave device has to be selected in >Control Panel/ Sounds and Mul- timedia/ Audio< or >Control Panel/ Sound/Playback<. Also check 'use preferred device only'.

The DVD software's audio properties now show the options 'SPDIF Out' or similar. When selecting these, the software will transfer the non-decoded digital multichannel data stream to the HDSP 9652.

Note

: This 'SPDIF' signal sounds like chopped noise at highest level. The first 2 channels

(Loudspeaker) do not support digital AC-3/DTS playback.

Multichannel

PowerDVD and WinDVD can also operate as software decoder, sending a DVD's multichannel data stream directly to the outputs of the HDSP 9652. Supported are all modes, from 2 to 8 channels, at 16 bit resolution and 48 kHz sample rate.

For this to work select the WDM playback device ’Loudspeaker’ of the HDSP 9652 in XP: >Control Panel/ Sounds and Multimedia/ Audio<, and 'Use only default devices' has to be

checked. Additionally the loudspeaker setup, found under >Volume/ Speaker Settings/ Ad- vanced< has to be changed from Stereo to 5.1 Surround.

Vista/7: >Control Panel/ Sound/ Playback < as ‘Standard’. Additionally the loudspeaker setup, found under >Configuration<, has to be changed from Stereo to 5.1 Surround.

PowerDVD's and WinDVD's audio properties now list several multichannel modes. If one of these is selected, the software sends the decoded analog multichannel data to the HDSP 9652. TotalMix can then be used to play back via any desired output channels.

The typical channel assignment for surround playback is: 1 (first chosen playback channel) - Left

2 - Right 3 - Center 4 - LFE (Low Frequency Effects) 5 - SL (Surround Left) 6 - SR (Surround Right)

Note 1

: Setting the card to be used as system playback device is against common sense, as professional cards are not specialized to play back system sounds, and shouldn't be disturbed by system events. To prevent this, be sure to re-assign this setting after usage, or to disable any system sounds (tab Sounds, scheme 'No audio').

Note 2

: The DVD player will be synced backwards from the HDSP card. This means when using AutoSync and/or word clock, the playback speed and pitch follows the incoming clock signal.

Page 20

User's Guide HDSP System HDSP 9652 © RME

12.3 Notes on WDM

The driver offers a WDM streaming device per stereo pair, like HDSP 9652 ADAT (1+2). WDM streaming is Microsoft's current driver and audio system, directly embedded into the operating system. WDM streaming is hardly usable for professional music purposes, as all data is processed by the so called Kernel Mixer, causing a latency of at least 30 ms. Additionally, WDM can perform sample rate conversions unnoticed, cause offsets between record and playback data, block channels unintentionally and much more.

Several programs do not offer any direct device selection. Instead they use the playback device selected in Windows under

XP: <Control Panel/ Sounds and Multimedia/ Audio> Vista/7: <Control Panel/ Sound/ Playback> The program Sonar from Cakewalk is unique in many ways. Sonar uses the so called WDM

Kernel Streaming, bypassing the WDM mixer, thus achieves a similar performance to ASIO.

Because of the driver's multichannel streaming ability (option Interleaved, see chapter 12.4), Sonar not only finds the stereo device mentioned above, but also the 8-channel interleaved devices, and adds the channel number at the end:

HDSP 9652 ADAT (1+2) is the first stereo device HDSP 9652 ADAT (3+4) is the next stereo device HDSP 9652 ADAT (1+2) 3/4 are the channels 3/4 of the first 8-channel interleaved device.

We recommend to not use these special interleaved devices. Also note that it is not possible to use one stereo channel twice (the basic and the interleaved device), even with different applications.

12.4 Channel Count under WDM

The HDSP system’s ADAT optical interfaces allow to record sample rates of up to 96 kHz using a standard ADAT recorder. For this to work single-channel data is spread to two ADAT channels using the Sample Multiplexing technique. This reduces the number of available ADAT channels from 8 to 4 per ADAT port.

It is nearly impossible to change the number of WDM devices without a reboot of the computer. Therefore whenever the HDSP 9652 changes into Double Speed (88.2/96 kHz) all devices stay present, but are partly inactive.

Page 21

User's Guide HDSP System HDSP 9652 © RME

WDM Stereo device Double Speed

HDSP 9652 ADAT (1+2) HDSP 9652 ADAT (1+2) HDSP 9652 ADAT (3+4) HDSP 9652 ADAT (3+4) HDSP 9652 ADAT (5+6) HDSP 9652 ADAT (5+6) HDSP 9652 ADAT (7+8) HDSP 9652 ADAT (7+8) HDSP 9652 ADAT (9+10) HDSP 9652 ADAT (9+10) HDSP 9652 ADAT (11+12) HDSP 9652 ADAT (11+12) HDSP 9652 ADAT (13+14) HDSP 9652 ADAT (13+14) HDSP 9652 ADAT (15+16) HDSP 9652 ADAT (15+16) HDSP 9652 ADAT (17+18) HDSP 9652 ADAT (17+18) HDSP 9652 ADAT (19+20) HDSP 9652 ADAT (19+20) HDSP 9652 ADAT (21+22) HDSP 9652 ADAT (21+22) HDSP 9652 ADAT (23+24) HDSP 9652 ADAT (23+24) HDSP 9652 SPDIF HDSP 9652 SPDIF

12.5 Multi-client Operation

RME audio interfaces support multi-client operation. This means several programs can be used at the same time. Also all formats (ASIO, WDM, GSIF) can be used simultaneously. The use of multi-client operation requires to follow two simple rules:

• Multi-client operation requires identical sample rates!

I.e. it is not possible to use one software with 44.1 kHz and the other with 48 kHz.

• Different software can not use the same channels at the same time.

If for example Cubase uses channels 1/2, this playback pair can't be used in WaveLab, no matter if ASIO or WDM. However, this is no limitation at all, because TotalMix allows for any output routing, and therefore a playback of multiple software on the same hardware outputs. Note that identical inputs can be used at the same time, as the driver simply sends the data to all applications simultaneously.

ASIO-Multiclient

RME audio interfaces support ASIO multi-client operation. It is possible to use more than one ASIO software at the same time. Again the sample rate has to be identical, and each software has to use its own playback channels. Once again the same inputs can be used simultaneously.

RME's sophisticated tool DIGICheck is an exception to this rule. It operates like an ASIO host, using a special technique to access playback channels already occupied. Therefore DIGICheck is able to analyse and display playback data from any software, no matter which format the software uses.

Page 22

User's Guide HDSP System HDSP 9652 © RME

Multi-Client and Multi-Channel using WDM

The WDM streaming devices of our driver can operate as usual stereo devices, or as 8-channel devices. The option Interleaved in the Settings dialog determines the current mode.

Interleaved not active: The WDM devices operate as usual stereo devices. The multi-client operation works as described above with WDM, ASIO and GSIF.

Interleaved active: The WDM devices can also be used as 8-channel devices. Unfortunately the Kernel Mixer, active with any WDM playback, then always occupies and blocks 8 channels at once, even when WaveLab or the Media Player perform just a stereo playback (2 channels). So:

If the Loudspeaker device is used, the whole 8-channel group is blocked. As a result, no second stereo pair of this group can be used, neither with ASIO nor GSIF.

Starting ASIO or GSIF playback on any of the stereo pairs of an 8-channel group prior to starting a WDM playback will prevent the Kernel Mixer from opening the 8-channel device, as two of its channels are already in use. The Kernel Mixer then automatically reverts to open a stereo device for a stereo playback.

An 8-channel playback using the Windows Media Player requires the speaker setup 7.1 Sur- round. Configure as follows:

XP: >Control Panel /Sounds and Multimedia /Audio /Volume /Speaker Settings /Advanced < Vista/7: >Control Panel /Sound /Playback /Loudspeaker /Configure <

12.6 Digital Recording

Unlike analog soundcards which produce empty wave files (or noise) when no input signal is present, digital I/O cards always need a valid input signal to start recording.

To take this into account, RME has included a comprehensive I/O signal status display (showing sample frequency, lock and sync status) in the HDSP 9652’s Settings dialog.

The sample frequency shown in the Settings dialog (see chapter 11, screenshot Settings) is useful as a quick display of the current configuration (the box itself and all connected external equipment). If no sample frequency is recognized, it will read ‘No Lock’.

This way, configuring any suitable audio application for digital recording is simple. After selecting the required input, Hammerfall DSP displays the current sample frequency. This parameter can then be changed in the application’s audio attributes (or similar) dialog.

The screenshot to the right shows a typical dialog used for changing basic parameters such as sample frequency and resolution in an audio application.

Any bit resolution can be selected, providing it is supported by both the audio hardware and the software. Even if the input signal is 24 bit, the application can still be set to record at 16-bit resolution. The lower 8 bits (and therefore any signals about 96dB below maximum level) are lost entirely. On the other hand, there is nothing to gain from recording a 16-bit signal at 24-bit resolution this would only waste precious space on the hard disk.

Page 23

User's Guide HDSP System HDSP 9652 © RME

It often makes sense to monitor the input signal or send it directly to the output. This can be done at zero latency using TotalMix (see chapter 24).

An automated control of real-time monitoring can be achieved by Steinberg’s ASIO protocol with our ASIO drivers and all ASIO 2 compatible programs. When 'ASIO Direct Monitoring' has been switched on, the input signal is routed in real-time to the output whenever a recording is started (punch-in).

13. Operation under ASIO

13.1 General

Start the ASIO software and select ASIO Ham- merfall DSP as the audio I/O device. The 'ASIO system control' button opens the HDSP Settings dialog (see chapter 11, Configuration).

13.2 Channel Count under ASIO

At a sample rate of 88.2 or 96 kHz, the ADAT optical input and outputs operate in S/MUX mode, so the number of available channels per port is reduced from 8 to 4.

Please note that when changing the sample rate range between Single and Double Speed the number of channels presented from the ASIO driver will change too. As some channels are removed, SPDIF and AES move up in the list. This may require a reset of the I/O list in the audio software, and will require a reassignment of the channels within the project.

Mono Channels Double Speed

HDSP 9652 ADAT 1 to 8 HDSP 9652 ADAT 1 to 4 HDSP 9652 ADAT 9 to 16 HDSP 9652 ADAT 5 to 8 HDSP 9652 ADAT 17 to 24 HDSP 9652 ADAT 9 to 12 HDSP 9652 SPDIF L / R HDSP 9652 SPDIF L / R

Page 24

User's Guide HDSP System HDSP 9652 © RME

13.3 Known Problems

If a computer does not provide sufficient CPU-power and/or sufficient PCI-bus transfer rates, then drop outs, crackling and noise will appear. We recommend to deactivate all PlugIns to verify that these are not the reason for such effects.

Additional hard disk controllers, both on-board and PCI based, often violate the PCI specs. To achieve the highest throughput they hog the PCI bus, even in their default setting. Thus when working with low latencies heavy drop outs (clicks) are heard. Try to solve this problem by changing the default setting of the controller (for example by reducing the 'PCI Bus Utilization').

Another common source of trouble is incorrect synchronization. ASIO does not support asynchronous operation, which means that the input and output signals not only have to use the same sample frequency, but also have to be in sync. All devices connected to the Hammerfall DSP must be properly configured for Full Duplex operation. As long as SyncCheck (in the Settings dialog) only displays Lock instead of Sync, the devices have not been set up properly!

When using more than one HDSP system all units have to be in sync, see chapter 15. Else a periodically repeated noise will be heard.

Hammerfall DSP supports ASIO Direct Monitoring (ADM). Please note that currently Nuendo, Cubase and Logic either do not support ADM completely or error-free. A well known problem is the wrong operation of a stereo channel’s panorama function.

In case of a drift between audio and MIDI, or in case of a fixed deviation (MIDI notes placed close before or behind the correct position), the settings in Cubase/Nuendo have to be changed. At the time of print the option 'Use System Timestamp' should be activated. The HDSP 9652 supports both MME MIDI and DirectMusic MIDI. It depends on the used application which one will work better.

13.4 Synchronization

To achieve sample-accuracy between the ADAT recorder and Hammerfall DSP while running Cubase, connect the ADAT sync output with the 9-pin D-type sync input of the HDSP. The ‘Time Code’ field in the Settings dialogue should now show the same position as the ADAT recorder.

Double-clicking on the Sync button in Cubase’s transport panel will open the ‘Synchronization’ dialog. Select ASIO 2.0 as the timecode base (under Sync Source), confirm the dialog with ‘OK’, then activate Sync mode by (single) clicking on the Sync button.

If synchronization is not working i.e. Cubase does not respond when the ADAT is set to ‘Play’, please try the following:

• Check the cables

• Switch Sync off and on again (in Cubase’s transport panel)

• Select ‘Reset Devices’ from the Options menu.

• Switch on the ADAT recorder(s) before starting Cubase

• Use the BRC as Master and send its word clock to all other devices

• Use the Clock Mode ADAT Sync

Page 25

User's Guide HDSP System HDSP 9652 © RME

14. Operation under GSIF (Gigasampler Interface)

The GSIF interface of the Hammerfall DSP allows direct operation with Gigastudio, with up to 26 channels, 96 kHz and 24 bit. The new GSIF 2.0 is also supported with both audio and MIDI.

The GSIF latency of the HDSP 9652 can be set between 32 and 256 samples. Above 256, only the ASIO latency will rise. Such a setting can prevent performance problems on slower machines when using ASIO and GSIF at the same time.

Please note that the Windows driver fully supports multi-client operation, including the combination WDM/ASIO. So for example Cubase, Gigastudio and Sonar can be used simultaneously, provided each of these programs uses its own audio channels exclusively. For example ASIO could use channels 1/2 and Gigastudio (with GSIF) channels 3/4 simultaneously, and so on.

Simultaneous operation of GSIF and ASIO requires to use different channels. For example, if Cubase uses tracks 1/2 these tracks can not be used by Gigastudio.

Common Problems Please note that Gigastudio is running unexpectedly in the background (thus blocking its assigned audio channels), as soon as the Gigastudio MIDI ports are used – even when Gigastudio itself hasn't been started. This causes a lot of confusion, as the driver seems to behave completely buggy, and the user does not recognize the simple reason for it – for example simultaneous operation of ASIO and GSIF on the same channels.

If Gigastudio starts up properly, loads gig files too, but won't play at all even when using the virtual keyboard: Go to Hardware/Routing and select a valid MIDI input port. Note that blank is not valid, but <none> is.

15. Using more than one Hammerfall DSP

The current drivers support operation of up to three HDSP 9652. All cards of the HDSP and HDSPe system use the same driver, therefore can be used at the same time. All units have to be in sync, i.e. have to receive valid sync information either via word clock or by using AutoSync and feeding synchronized signals.

• If one of the HDSP systems is set to clock mode Master, all others have to be set to clock mode AutoSync, and have to be synced from the master, for example by feeding word clock. The clock modes of all units have to be set up correctly in their Settings dialog.

• If all units are fed with a synchronous clock, i.e. all units show Sync in their Settings dialog, all channels can be used at once. This is especially easy to handle under ASIO, as the ASIO driver presents all units as one.

Note

: TotalMix is part of the hardware of each HDSP system. Up to three mixers are available, but these are separated and can't interchange data. Therefore a global mixer for all units is not possible.

Page 26

User's Guide HDSP System HDSP 9652 © RME

16. DIGICheck

The DIGICheck software is a unique utility developed for testing, measuring and analysing digital audio streams. Although this software is fairly self-explanatory, it still includes a comprehensive online help. DIGICheck 5.2 operates as multi-client ASIO host, therefore can be used in parallel to any software with both inputs and outputs (!). The following is a short summary of the currently available functions:

• Level Meter. High precision 24-bit resolution, 2/8/36 channels. Application examples: Peak level measurement, RMS level measurement, over-detection, phase correlation measurement, dynamic range and signal-to-noise ratios, RMS to peak difference (loudness), long term peak measurement, input check. Oversampling mode for levels higher than 0 dBFS. Vertical and horizontal mode. Slow RMS and RLB weighting filter. Supports visualization according to the K-system.

• Hardware Level Meter for Input, Playback and Output. As above, received pre-calculated directly from the HDSP system hardware with near zero CPU load.

• Spectral Analyser. World wide unique 10-, 20- or 30-band display in analog bandpass-filter technology. 192 kHz-capable!

• Vector Audio Scope. World wide unique Goniometer showing the typical afterglow of an oscilloscope-tube. Includes Correlation meter and level meter.

• Surround Audio Scope. Professional Surround Level Meter with extended correlation analysis.

• Totalyser. Spectral Analyser, Level Meter and Vector Audio Scope in a single window.

• Bit Statistics & Noise. Shows the true resolution of audio signals as well as errors and DC

offset. Includes Signal to Noise measurement in dB and dBA, plus DC measurement.

• Channel Status Display. Detailed analysis and display of SPDIF and AES/EBU Channel Status data.

• Global Record. Long-term recording of all channels at lowest system load.

• Completely multi-client. Open as many measurement windows as you like, on any chan-

nels and inputs or outputs!

To install DIGICheck, go to the \DIGICheck directory on the RME Driver CD and run setup.exe. Follow the instructions prompted on the screen.

DIGICheck is constantly improved. The latest version is always found on our website www.rme-audio.de, section Downloads / DIGICheck.

Page 27

User's Guide HDSP System HDSP 9652 © RME

17. Hotline – Troubleshooting

17.1 General

The newest information can always be found on our website www.rme-audio.com, section FAQ, Latest Additions.

The input signal cannot be monitored in real-time

• ASIO Direct Monitoring has not been enabled, and/or monitoring has been disabled globally (for example in TotalMix).

The 8 ADAT channels don’t seem to work

• The optical output ADAT1 has been switched to 'SPDIF'. The ADAT playback devices are still usable by routing and mixing them in TotalMix to other outputs.

Low Latency ASIO operation under Windows 2000/XP on single CPU systems:

• To use ASIO at lowest latencies under Windows 2000/XP even when only having one CPU, the system performance has to be optimized for background tasks. Go to >Control Panel/ System/ Advanced/ Performance Options<. Change the default 'Applications' to 'Background tasks'. The lowest usable latency will drop from 23 ms to around 3 ms.

Playback works, but record doesn’t

• Check that there is a valid signal at the input. If so, the current sample frequency is displayed in the Settings dialog.

• Check whether the HDSP system has been selected as recording device in the audio application.

• Check whether the sample frequency set in the audio application (‘Recording properties’ or similar) matches the input signal.

Crackle during record or playback

• Increase the number and size of buffers in the ‘Settings’ dialog or in the application.

• Try different cables (coaxial or optical) to rule out any defects here.

• Check that cables/devices have not been connected in a closed loop. If so, set the system’s

clock mode to ‘Master’.

• Increase the buffer size of the hard disk cache.

• Activate Busmaster mode for the hard disks.

• In case of a recently done BIOS update of the motherboard: Probably 'Load BIOS Defaults'

was loaded instead of 'Load Setup Defaults'. This sets the 'PCI Latency Timer' to 0 (default:

32).

ADAT timecode is running, but Cubase does not start 'Play' automatically

• The input displayed in ‘Sync Ref’ is not in sync mode. Sync mode is essential, because ADAT’s so-called time code is really a sample position, and is therefore only valid for synchronous audio data.

• Sync is displayed (referring to the card’s clock), but the incoming data is not in sync with the sample position received at the ADAT Sync In. Then Cubase does not start. Remedy: Set ‘Pref. Sync Ref’ to the input corresponding to the received ADAT Sync signal.

• Sync mode wasn't activated (button in the transport panel), or ASIO 2.0 has not been chosen as the SMPTE sync source.

Page 28

User's Guide HDSP System HDSP 9652 © RME

The ADAT timecode is not in sync

• The tape is formatted to 48 kHz, but played back at 44.1 kHz (Pitch). This 'Blackface' problem cannot be solved in a satisfactory way.

17.2 Installation

HDSP 9652 is found in the Device Manager (>Settings/ Control Panel/ System<), category 'Sound-, Video- and Gamecontroller'. A double click on 'HDSP 9652' starts the properties dialog. Choosing 'Resources' shows interrupt and memory range.

The newest information on hardware problems can always be found on our website www.rme-

audio.com, section FAQ, Hardware Alert: about incompatible hardware.

The dialog 'New hardware component found’ does not appear:

• Check whether the PCI card is completely inserted into the PCI slot.

The card and drivers have been installed correctly, but playback does not work:

• Check whether the Hammerfall DSP appears in the Device Manager. If the ' Hammerfall DSP’ device has a yellow exclamation mark, then there is an address or interrupt conflict.

• Even if there is no yellow exclamation mark, it's still worth checking the ‘Resources’ tab.

Page 29

User's Guide HDSP System HDSP 9652 © RME

User's Guide

HDSP 9652

Driver Installation and Operation – Mac OS X

Page 30

User's Guide HDSP System HDSP 9652 © RME

18. Driver and Flash Update

18.1 Driver Installation

First fit the card (see 5. Hardware Installation), then switch on the computer and install the drivers from the RME Driver CD. The driver file is located in the folder Hammerfall DSP. Installation works automatically by a double-click on the file hdsp.mpkg.

RME recommends to download the latest driver version from the RME website! If done, the procedure is as follows:

Double-click onto hdsp_16c.gz to expand the archive file to hdsp_16c.tar and the folder hdsp_16c, which includes the driver file hdsp.mpkg. Installation works automatically by a double-click on this file.

During driver installation the programs Settings and Mixer (TotalMix) will also be installed. Both programs start automatically as soon as a HDSP system is detected. They stay in the dock when exited, and remove themselves automatically from the dock when the HDSP system is removed.

Reboot the computer when installation is done.

18.2 Driver Update

In case of a driver update it's not necessary to remove the old driver first, it will be overwritten during the installation.

Exception: driver updates from version <1.6. Remove the former Settings dialog and TotalMix from the Login Items, and delete both files from your hard drive!

This driver version did not have the features AutoLoad, Dock Lock and AutoRemove. Therefore one has to make sure that both programs have been removed from the system, to prevent the old Settings dialog and TotalMix from being loaded.

18.3 Flash Update

The Flash Update Tool updates HDSP 9652 to the latest version. It requires an already installed driver.

Start the program HDSP Flash. The Flash Update Tool displays the current revision of the HDSP 9652, and whether it needs an update or not. If so, then simply press the 'Update' button. A progress bar will indicate when the flash process is finished. The bar moves slowly first (program), then faster (verify).

If more than one interface card is installed, all cards can be flashed by changing to the next tab and repeating the process.

After the update the PCI card needs to be reset. This is done by powering down and shutting off the PC. A warm boot is not enough!

Page 31

User's Guide HDSP System HDSP 9652 © RME

19. Configuring the HDSP 9652

19.1 Settings Dialog

Configuring the HDSP 9652 is done via its own settings dialog. The panel 'Settings' can be opened by clicking on the hammer icon in the dock. The mixer of the Hammerfall DSP System, TotalMix, can be opened by clicking on the mixer icon in the dock.

The Hammerfall DSP’s hardware offers a number of helpful, well thought-of practical functions and options which affect how the card operates - it can be configured to suit many different requirements. The following is available in the 'Settings' dialog:

• Input selection

• Output mode

• Output channel status

• Synchronization behaviour

• Input and output status display

Any changes performed in the Settings dialog are applied immediately - confirmation (e.g. by exiting the dialog) is not required. However, settings should not be changed during playback or record if it can be avoided, as this can cause unwanted noises.

The status displays at the bottom of the dialog box give the user precise information about the current status of the system, and the status of all digital signals. SyncCheck indicates whether there is a valid signal (Lock, No Lock) for each input (Word Clock, ADAT, SPDIF), or if there is a valid and synchronous signal (Sync). The AutoSync Reference display shows the input and frequency of the current sync source.

SPDIF In Defines the input for the SPDIF signal. 'Coaxial' relates to the RCA socket, 'ADAT1' to the optical TOSLINK input.

SPDIF Out

The SPDIF output signal is constantly available at the phono plug. After selecting 'ADAT1' it is also routed to the optical TOSLINK output. For further details about the settings ‘Professional’, ‘Emphasis’ and ‘Non-Audio’, please refer to chapter 24.2.

AEB

Selecting ADAT1 Int. switches the ADAT input from optical (TOSLINK) to the internal connector, which allows for a connection of a RME Expansion Board (AEB4-I, AEB8-I, TEB).

SPDIF Freq.

Displays the sample rate of the signal at the SPDIF input.

Page 32

User's Guide HDSP System HDSP 9652 © RME

Clock Mode

The unit can be configured to use its internal clock source (Master), or the clock source predefined via Pref. Sync Ref (AutoSync).

Pref Sync Ref

The automatic clock selection checks and changes between the clock sources Word Clock, ADAT optical, ADAT Sync and SPDIF.

Word Clock Out

Time Code

Time Code from the input ADAT Sync. Not available for the HDSP 9652 under OS X.

System Clock

Shows the current clock state of the HDSP system. The system is either Master (using its own clock) or Slave (see AutoSync Ref).

SyncCheck

SyncCheck indicates whether there is a valid signal (Lock, No Lock) for each input (Word Clock, ADAT1-3, ADAT Sync, SPDIF), or if there is a valid and synchronous signal (Sync). The AutoSync Reference display shows the input and frequency of the current sync source.

Page 33

User's Guide HDSP System HDSP 9652 © RME

19.2 Clock Modes - Synchronisation

In the digital world, all devices are either the ‘Master’ (clock source) or a ‘Slave’ synchronized to the master. Whenever several devices are linked within a system, there must always be a single master clock. The Hammerfall DSP’s intelligent clock control is very user-friendly, being able to switch between clock modes automatically. Selecting AutoSync will activate this mode.

In AutoSync mode, the system constantly scans all digital inputs for a valid signal. If this signal corresponds with the current playback sample rate, the card switches from the internal quartz (AutoSync Ref displays 'Master') to a clock generated from the input signal (AutoSync Ref displays 'Slave'). This allows on-the-fly recording, even during playback, without having to synchronize the card to the input signal first. It also allows immediate playback at any sample rate without having to reconfigure the card.

Remember that a digital system can only have one master! If the HDSP’s clock mode is set to 'Master', all other devices must be set to ‘Slave’.

The Hammerfall DSP's ADAT optical input and the SPDIF input operate simultaneously. Because there is no input selector however, the HDSP has to be told which of the signals is the sync reference (a digital device can only be clocked from a single source). This is why the system has been equipped with automatic clock source selection, which adopts the first available input with a valid digital signal as the clock reference input. The input currently used as sync reference is shown in the AutoSync Ref status field, together with its sample frequency.

Page 34

User's Guide HDSP System HDSP 9652 © RME

If several digital devices are to be used simultaneously in a system, they not only have to operate with the same sample frequency but also be synchronous with each other. This is why digital systems always need a single device defined as ‘master’, which sends the same clock signal to all the other (‘slave’) devices.

RME’s exclusive SyncCheck technology (first implemented in the Hammerfall) enables an easy to use check and display of the current clock status. The ‘SyncCheck’ field indicates whether no signal (‘No Lock’), a valid signal (‘Lock’) or a valid and synchronous signal (‘Sync’) is present at each of the digital clock source inputs. The AutoSync Reference display shows the current sync source and the measured frequency.

An example to illustrate this: The ADAT1 and ADAT2 inputs are receiving signals from a digital mixing desk that has been set to clock mode 'Internal' or 'Master'. An ADAT recorder is connected to the ADAT3 input. The Hammerfall DSP is set to AutoSync mode. As expected, SyncCheck shows that the ADAT1 and ADAT2 inputs are in sync (as they are driven by the same clock from the mixing desk), but shows ‘Lock’ instead of 'Sync' for the ADAT3 input. Because the ADAT recorder is not receiving any signals from HDSP or from the mixer, it will generate its own clock at a rate which is (almost) the same as the sample frequency of the mixing desk - but not identical.

Thanks to its AutoSync technique and lightning fast PLLs, the HDSP is not only capable of handling standard frequencies, but also any sample rate between 28 and 103 kHz. Even the word clock input, which most users will use in varispeed operation, allows any frequency between 28 kHz and 103 kHz.

Page 35

User's Guide HDSP System HDSP 9652 © RME

20. Mac OS X FAQ

20.1 Round about Driver Installation

The driver with the file suffix gz provided by RME is a compressed TAR archive. TAR bundles multiple files and folders into one file, but does not save memory space nor download time. Both TAR and gz are supported natively by OS X, a double click on the file is all you need to do.

Older browsers do not recognize gz as an archive, loading the file as a document. This results in a cryptic looking text within the browser window. Downloading the file can be done via the right mouse key, Save Target as. Despite this procedure, some older browsers like Netscape

4.78 will not save the file correctly - the archive will be corrupted. The driver consists of a package file (pkg), which contains various folders and files, similar to

TAR. A double click will start the OS X installer. To save you the hassle of installing both audio and MIDI drivers separately, the HDSP driver contains an additional meta package (mpkg), that points to the single packages. Those single packages are not shown in the Finder, as they reside within the invisible folder '.contained_packages'. Only the mpkg is visible. Important: an installation can only be done with the complete folder. If only the mpkg is copied to a different place, it will not find the single driver packages!

The actual audio driver appears as a kernel extension file. The installer copies it to >System/ Library/ Extensions<. Its name is HammerfallDSP.kext. It is visible in the Finder, allowing you to verify date and driver version. Yet, in fact this again is a folder containing subdirectories and files.

Nonetheless, this 'driver file' can be removed by simply dragging it to the trash bin. This can be helpful in case a driver installation fails. An incomplete installation can currently (10.3.2) only be detected indirectly: The installation routine does not open a message window with a note about a restart of the computer. This indicates that the driver file was not copied and the driver was not installed!

Several users have observed that the installation routine occasionally stops and no longer works correctly. This can be fixed by removing the corresponding extension file prior to installation. In some cases, also (or only) a repair of the disk permission will help.

We have also received reports saying the driver update could not be installed on the system disk - shown red crossed during the installation. Repairing permission may also help here. If not, we're sorry, but have to recommend to contact Apple. Our driver has no knowledge of folders, disks etc., the installation is handled completely by the OS X installer.

20.2 MIDI doesn't work

In some cases MIDI does not work after the installation of the HDSP driver. To be precise, applications do not show an installed MIDI port. The reason for this is usually visible within the Audio MIDI Setup. It displays no RME MIDI device, or the device is greyed out and therefore inactive. Mostly, removing the greyed out device and searching for MIDI devices again will solve the problem. If this does not help, we recommend manual removal of the MIDI driver and reinstallation of the complete driver. Otherwise repairing permissions may help.

The HDSP MIDI driver is a plugin. During installation it will be copied to >Library/ Audio/ MIDI Drivers<. Its name is Hammerfall DSP MIDI.plugin. The file can be displayed in the Finder and also be removed by simply dragging it to the trash bin.

Page 36

User's Guide HDSP System HDSP 9652 © RME

20.3 Supported Sample Rates

RME's Mac OS X driver supports all sampling frequencies provided by the hardware. Besides 96 kHz this also includes 32 kHz and 64 kHz.

But not every software will support all the hardware's sample rates. The hardware's capabilities can easily be verified in the Audio MIDI Setup. Select Audio devices under Properties of: and choose the Hammerfall DSP. A click on Format will list the supported sample frequencies.

If the unit is in clock mode Master, selecting a sample rate will immediately set the device to this frequency, which can be verified in the HDSP's settings dialog (System Clock). Format thus allows you to activate any sampling frequency quickly and easily.

20.4 Channel Count under Core Audio

It is not possible to change the number of Core Audio devices without a reboot of the computer. Therefore whenever the 9652 changes into Double Speed (88.2/96 kHz) mode all devices stay present, but are partly inactive.

Core Audio Double Speed

HDSP 9652 ADAT 1 to 8 HDSP 9652 ADAT 1 to 4 HDSP 9652 ADAT 9 to 16 HDSP 9652 ADAT 5 to 8 HDSP 9652 ADAT 17 to 24 HDSP 9652 ADAT 9 to 12 HDSP 9652 SPDIF L / R HDSP 9652 SPDIF L / R

20.5 Repairing Disk Permissions

Repairing permission can solve problems with the installation process - plus many others. To do this, launch Disk Utility located in Utilities. Select your system drive in the drive/volume list to the left. The First Aid tab to the right now allows you to check and repair disk permissions.

20.6 PCI card and PCI slot compatibility

Unfortunately not every RME card will work in every PCI slot of an Apple computer. To our knowledge, the current Hammerfall DSP systems can be used in any PCI slot of all G4 and G5 models. In case additional PCI cards of any manufacturer are used, it might happen that the RME card is no longer found by the system. Swapping cards between slots can be helpful in this case.

Page 37

User's Guide HDSP System HDSP 9652 © RME

21.6 Various Information

The driver requires 10.2.8 or higher. Older versions of OS X are not and will not be supported. Via >System Preferences/ Audio-MIDI Setup< the hardware can be configured for the system

wide usage. Programs that don't support card or channel selection will use the device selected as Standard-Input and Standard-Output. (Soundstudio, Mplayer, Amplitube etc.).

In the lower part of the window, the audio hardware's capabilities are shown and can be changed in some cases. On the record side no changes are possible. Programs that don't support channel selection will always use channels 1/2, the first stereo pair. To access other inputs use the following workaround with TotalMix and a loopback cable (see chapter 26.5): route the desired input signal to output channels 1/2. Plug a cable from output ADAT1 to input ADAT1. Check valid clock mode! Result: the desired input signal is now available at input channel 1/2, without further delay/latency.

Since OS X 10.3 playback can be configured freely and to any of the available playback channels. This is done via Speaker Setup. Even multichannel playback (Surround, DVD Player) can be set up easily.

OS X supports more than one audio device. Since 10.4 (Tiger) Core Audio offers the function Aggregate Devices, which allows to combine several devices into one, so that a multi-device operation is now possible with any software.

The Hammerfall DSP driver adds a number to each unit, so they are fully accessible in any multicard-capable software.

21. Hotline – Troubleshooting

The newest information can always be found on our website www.rme-audio.com, section Support, Macintosh OS.

The 8 ADAT channels 1-8 don’t seem to work

• The optical output ADAT1 has been switched to 'SPDIF'. The ADAT playback devices are still usable by routing and mixing them in TotalMix to other outputs.

Playback works, but record doesn’t:

• Check that there is a valid signal at the input.

• Check whether the Hammerfall DSP has been selected as recording device in the audio

application.

Crackle during record or playback:

• Increase the number and size of buffers in the application.

• Try different cables to rule out any defects here.

The card and drivers have been installed correctly, but playback does not work:

• Is Hammerfall DSP listed in the System Profiler/PCI? (Vendor 10EE, Device ID 3FC5).

• Has Hammerfall DSP been selected as current playback device in the audio application?

Page 38

User's Guide HDSP System HDSP 9652 © RME

Page 39

User's Guide HDSP System HDSP 9652 © RME

User's Guide

HDSP 9652

Connections and TotalMix

Page 40

User's Guide HDSP System HDSP 9652 © RME

22. Digital Connections

22.1 ADAT

The ADAT optical input of the HDSP system is fully compatible with all ADAT optical outputs. RME's unsurpassed Bitclock PLL prevents clicks and drop outs even in extreme varipitch operation, and guarantees a fast and low jitter lock to the digital input signal. A usual TOSLINK cable is sufficient for connection. More information on Double Speed (S/MUX) can be found in chapter 32.3.

ADAT 1 In

Interface for a device sending an ADAT signal to the HDSP 9652. Carries the channels 1 to 8. When receiving a Double Speed signal, this input carries the channels 1 to 4. Can also be used as SPDIF optical input.

ADAT 1 Out

Interface for a device receiving an ADAT signal from the HDSP 9652. Transmits channels 1 to

8. When sending a Double Speed signal, this port carries channels 1 to 4. Can also be used as SPDIF optical output.

ADAT 2/3 In

Interface for a device sending an ADAT signal to the HDSP 9652. Carries the channels 9 to 24. When receiving a Double Speed signal, this input carries the channels 5 to 8 and 9 to 12.

ADAT 2/3 Out

Interface for a device receiving an ADAT signal from the HDSP 9652. Transmits channels 9 to

24. When sending a Double Speed signal, this port carries channels 5 to 8 and 9 to 12.

22.2 SPDIF

Input

The SPDIF input is configured in the Settings dialog, available by a click on the hammer symbol in the Task Bar's system tray. The HDSP system accepts all commonly used digital sources as well as SPDIF and AES/EBU. Channel status and copy protection are ignored.

To receive signals in AES/EBU format, an adapter cable is required. Pins 2 and 3 of a female XLR plug are connected individually to the two pins of a phono plug. The cable shielding is only connected to pin 1 of the XLR - not to the phono plug.

The ground-free design, with transformers for coaxial digital inputs and outputs, offers a troublefree connection of all devices along with perfect hum rejection and full AES/EBU compatibility.

Output In SPDIF mode, identical signals are available at both the optical and the coaxial output. An obvious use for this would be to connect two devices, i.e. using the HDSP as a splitter (distribution 1 on 2).

Apart from the audio data itself, digital signals in SPDIF or AES/EBU format have a header containing channel status information. False channel status is a common cause of malfunction. The HDSP system ignores the received header and creates a totally new one for its output signal.

Page 41

User's Guide HDSP System HDSP 9652 © RME

Note that in record or monitor modes, set emphasis bits will disappear. Recordings originally done with emphasis should always be played back with the emphasis bit set!

This can be done by selecting the Emphasis switch in the Settings dialog (field SPDIF Out). This setting is updated immediately, even during playback.

The HDSP 9652’s new output header is optimized for largest compatibility with other digital devices:

• 32 kHz, 44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz depending on the current sample rate

• Audio use, Non-Audio

• No Copyright, Copy Permitted

• Format Consumer or Professional

• Category General, Generation not indicated

• 2-channel, No Emphasis or 50/15 µs

• Aux bits Audio Use

Professional AES/EBU equipment can be connected to the HDSP 9652 thanks to the transformer-balanced coaxial output, and the ‘Professional’ format option with doubled output voltage. Output cables should have the same pinout as those used for input (see above), but with a male XLR plug instead of a female one.

Note that most consumer HiFi equipment (with optical or phono SPDIF inputs) will only accept signals in ‘Consumer’ format!

The audio bit in the header can be set to 'Non-Audio'. This is often necessary when Dolby AC-3 encoded data is sent to external decoders (surround-sound receivers, television sets etc. with AC-3 digital inputs), as these decoders would otherwise not recognize the data as AC-3.

22.3 Word Clock

The HDSP 9652's word clock input is a high impedance type (not terminated). Termination with 75 Ohm is available via jumper X105 on the Expansion Board.

Thanks to a low impedance, but short circuit proof output, the HDSP 9652 delivers 4 Vpp to 75 Ohms. For wrong termination with 2 x 75 Ohms (37.5 Ohms), there are still 3.3 Vpp at the output.

Selecting Single Speed in the Settings dialog causes the output signal to always stay within the range of 32 kHz to 48 kHz. So at 96 kHz sample rate, the output word clock is 48 kHz.

22.4 MIDI

The HDSP 9652 offers two MIDI I/O via two 5-pin DIN connectors each. The MIDI ports are added to the system by the driver. Using MIDI capable software, these ports can be accessed under the name HDSP MIDI. Using more than one HDSP 9652, the operating system adds a consecutive number to the port name, like HDSP MIDI In (3) etc.

The MIDI In port is available for both GSIF (GSIF-2 Low Latency) and standard MME MIDI simultaneously.

Page 42

User's Guide HDSP System HDSP 9652 © RME

23. Word Clock

23.1 Technical Description and Usage

In the analog domain one can connect any device to another device, a synchronisation is not necessary. Digital audio is different. It uses a clock, the sample frequency. The signal can only be processed and transmitted when all participating devices share the same clock. If not, the signal will suffer from wrong samples, distortion, crackle sounds and drop outs.

AES/EBU, SPDIF and ADAT are self-clocking, an additional word clock connection in principle isn't necessary. But when using more than one device simultaneously problems are likely to happen. For example any self-clocking will not work in a loop cabling, when there is no 'master' (main clock) inside the loop. Additionally the clock of all participating devices has to be synchronous. This is often impossible with devices limited to playback, for example CD players, as these have no SPDIF input, thus can't use the self clocking technique as clock reference.

In a digital studio synchronisation is maintained by connecting all devices to a central sync source. For example the mixing desk works as master and sends a reference signal, the word clock, to all other devices. Of course this will only work as long as all other devices are equipped with a word clock or sync input, thus being able to work as slave (some professional CD players indeed have a word clock input). Then all devices get the same clock and will work in every possible combination with each other.

Remember that a digital system can only have one master!

23.2 Cabling and Termination

Word clock signals are usually distributed in the form of a network, split with BNC T-adapters and terminated with resistors. We recommend using off-the-shelf BNC cables to connect all devices, as this type of cable is used for most computer networks. You will find all the necessary components (T-adapters, terminators, cables) in most electronics and/or computer stores. The latter usually carries 50 Ohms components. The 75 Ohms components used for word clock are part of video technology (RG59).

Ideally, the word clock signal is a 5 Volt square wave with the frequency of the sample rate, of which the harmonics go up to far above 500 kHz. To avoid voltage loss and reflections, both the cable itself and the terminating resistor at the end of the chain should have an impedance of 75 Ohm. If the voltage is too low, synchronization will fail. High frequency reflection effects can cause both jitter and sync failure.

Unfortunately there are still many devices on the market, even newer digital mixing consoles, which are supplied with a word clock output that can only be called unsatisfactory. If the output breaks down to 3 Volts when terminating with 75 Ohms, you have to take into account that a device, of which the input only works from 2.8 Volts and above, does not function correctly already after 3 meter cable length. So it is not astonishing that because of the higher voltage, word clock networks are in some cases more stable and reliable if cables are not terminated at all.

Ideally all outputs of word clock delivering devices are designed with very low impedance, but all word clock inputs with high impedance, in order to not weaken the signal on the chain. But there are also negative examples, when the 75 Ohms are built into the device and cannot be switched off. In this case the network load is often 2 x 75 Ohms, and the user is forced to buy a special word clock distributor. Note that such a device is generally recommended for bigger studios.

Page 43

User's Guide HDSP System HDSP 9652 © RME

The HDSP 9652’s word clock input can be high-impedance or terminated internally, ensuring maximum flexibility. If termination is necessary (e.g. because HDSP 9652 is the last device in the chain), bring jumper X105 on the Expansion Board into position 75 Ohm.

In case the HDSP 9652 resides within a chain of devices receiving word clock, plug a T-adapter into its BNC input jack, and the cable supplying the word clock signal to one end of the adapter. Connect the free end to the next device in the chain via a further BNC cable. Remove jumper X105 from the Expansion Board. The last device in the chain should be terminated using another T-adapter and a 75 Ohm resistor (available as short BNC plug). Of course devices with internal termination do not need T-adaptor and terminator plug.

23.3 Operation

The HDSP 9652's word clock input is active when Pref. Sync Ref in the Settings dialog has been set to Word Clock, the clock mode AutoSync has been activated, and a valid word clock signal is present. The signal at the BNC input can be Single or Double Speed, the Hammerfall DSP automatically adapts to it. As soon as there is a valid signal at the BNC jack, AutoSync Ref will display Word. This message has the same function as the green Lock LED, but appears on the monitor, i.e. the user can check immediately whether a valid word clock signal is present and is currently being used.

In the line Freq., the AutoSync Ref shows the frequency of the reference signal, measured by the hardware. In this case the frequency of the current word clock signal is measured and displayed.

The word clock output of the Hammerfall DSP is constantly active, providing the current sample frequency as word clock signal. As a result, in Master mode the provided word clock is defined by the currently used software. In Slave mode, the provided frequency is identical to the one present at the currently chosen clock input. When the current clock signal fails, the Hammerfall DSP switches to Master mode and adjusts itself to the next, best matching frequency (44.1 kHz, 48 kHz etc.).

Page 44

User's Guide HDSP System HDSP 9652 © RME

24. TotalMix: Routing and Monitoring

24.1 Overview

The HDSP 9652 includes a powerful digital real-time mixer, the Hammerfall DSP mixer, based on RME’s unique, sample-rate independent TotalMix technology. It allows for practically unlimited mixing and routing operations, with all inputs and playback channels simultaneously, to any hardware outputs.

Here are some typical applications for TotalMix:

• Setting up delay-free submixes (headphone mixes). The HDSP 9652 allows for up to 13 (!) fully independent stereo submixes. On an analog mixing desk, this would equal 26 (!) Aux sends.

• Unlimited routing of inputs and outputs (free utilisation, patchbay functionality).

• Distributing signals to several outputs at a time. TotalMix offers state-of-the-art splitter and

distributor functions.

• Simultaneous playback of different programs using only one stereo output. The ASIO multiclient driver allows to use several programs at the same time, but only on different playback channels. TotalMix provides the means to mix and monitor these on a single stereo output.

• Mixing of the input signal to the playback signal (complete ASIO Direct Monitoring). RME not only is the pioneer of ADM, but also offers the most complete implementation of the ADM functions.

• Integration of external devices. Use TotalMix to insert external effects devices, be it in the playback or in the record path. Depending on the current application, the functionality equals insert or effects send and effects return, for example as used during real-time monitoring when adding some reverb to the vocals.

Every single input channel, playback channel and hardware output features a Peak and RMS level meter, calculated in hardware (hardware output is Peak only). These level displays are very useful to determine the presence and routing destinations of the audio signals.

For a better understanding of the TotalMix mixer you should know the following:

• As shown in the block diagram (next page), the record signal usually stays un-altered. TotalMix does not reside within the record path, and does not change the record level or the audio data to be recorded (exception: loopback mode).

• The hardware input signal can be passed on as often as desired, even with different levels. This is a big difference to conventional mixing desks, where the channel fader always controls the level for all routing destinations simultaneously.

• The level meter of inputs and playback channels are connected pre-fader, to be able to visually monitor where a signal is currently present. The level meters of the hardware’s outputs are connected post-fader, thus displaying the actual output level.

Page 45

User's Guide HDSP System HDSP 9652 © RME

Page 46

User's Guide HDSP System HDSP 9652 © RME

24.2 The User Interface

The visual design of the TotalMix mixer is a result of its capability to route hardware inputs and software playback channels to any hardware output. The HDSP 9652 provides 26 input channels, 26 software playback channels, and 26 hardware output channels:

52 channels don't fit on the screen side by side, neither does such an arrangement provide a useful overview. The input channel should be placed above the corresponding output channel. Therefore, the channels have been arranged as known from an Inline desk, so that the row Software Playback equals the Tape Return of a real mixing desk:

• Top row: Hardware inputs. The level shown is that of the input signal, i. e. fader independent. Via fader and routing field, any input channel can be routed and mixed to any hardware output (bottom row).

• Middle row: Playback channels (playback tracks of the audio software). Via fader and routing field, any playback channel can be routed and mixed to any hardware output (third row).

• Bottom row (third row): Hardware outputs. Here, the total level of the output can be adjusted.

This may be the level of connected loudspeakers, or the necessity to reduce the level of an overloaded submix.

The following chapters explain step by step all functions of the user interface.

Page 47

User's Guide HDSP System HDSP 9652 © RME

24.3 Elements of a Channel

A single channel consists of various elements: Input channels and playback channels each have a mute and solo button. Below there is the panpot, realized as indicator bar (L/R) in order to save space. In the field below, the present level is displayed in RMS or Peak, being updated

about every half a second. Overs (overload) are indicated here by an additional red dot.

Next is the fader with a level meter. The meter shows both peak values (zero attack, 1 sample is enough for a full scale display) by means of a yellow line, and mathematically correct RMS values by means of a green bar. The RMS display has a relatively slow time constant, so that it shows the average loudness quite well.

Below the fader, the current gain and panorama values are shown. The grey area shows the channel name. Selecting one or more channels is done by

clicking on the grey label which turns orange then. A right mouse click opens a dialog to type in a new name.

The black area (routing field) shows the current routing target. A mouse click opens the routing window to select a routing target. The list shows all currently activated routings by checkmarks in front of the routing targets.

24.4 Tour de TotalMix

This chapter is a practical guide and introduction on how to use TotalMix and on how TotalMix works.

Starting up TotalMix the last settings are recalled automatically. When executing the application for the first time, a default file is loaded, sending all playback tracks 1:1 to the corresponding hardware outputs with 0 dB gain, and activating SPDIF monitoring.

Hold down Ctrl and click on preset button 1 to make sure that factory preset 1 is loaded. The faders in the top row are set to maximum attenuation (called m.a. in the following), so there is no monitoring of the input channels. The Submix View is active, therefore for improved overview all outputs except Phones are greyed out. Additionally all faders are set to the routing target SPDIF. All faders of the middle row are set to 0 dB, so no matter on which channels a playback happens, the audio will be audible via the SPDIF output. Just try it!

We will now create a submix on output ADAT1 1/2. Please start a multi-track playback. In the third row, click on the channels of hardware output A1_1 or A1_2. The Submix View changes from SPDIF to A1_1/A1_2. Both the fader settings and the output levels of all other channels are still visible, but greyed out for improved orientation.

As soon as A1_1/A1_2 became active, all faders of the second row jumped to their bottom position – except those of playback channel 1/2. This is correct, because as mentioned above the factory preset includes a 1:1 routing. Click on A1_3/A1_4 and the faders above are the only active ones, same for A1_5/A1_6 and so on.

Back to A1_1/A1_2. Now you can change all the faders of all inputs and playback channels just as you like, thus making any input and playback signals audible via the outputs A1_1/A1_2. The panorama can be changed too. Click into the area above the fader and drag the green bar in order to set the panorama between left and right. The level meters of the third row display the level changes in real-time.

Page 48

User's Guide HDSP System HDSP 9652 © RME

You see, it is very easy to set up a specific submix for whatever output: select output channel, set up fader and pans of inputs and playbacks – ready!

For advanced users sometimes it makes sense to work without Submix View. Example: you want to see and set up some channels of different submixes simultaneously, without the need to change between them all the time. Switch off the Submix View by a click on the green button. Now the black routing fields below the faders no longer show the same entry (A1 1+2), but completely different ones. The fader and pan position is the one of the individually shown routing destination.

In playback channel 1 (middle row), labelled Out 1, click onto the routing field below the label. A list pops up, showing a checkmark in front of 'A1 1+2' and 'SPDIF'. So currently playback channel 1 is sent to these two routing destinations. Click onto 'A1 7+8'. The list disappears, the routing field no longer shows 'A1 1+2', but ' A1 7+8'. Now move the fader with the mouse. As soon as the fader value is unequal m.a., the present state is being stored and routing is activated. Move the fader button to around 0 dB. The present gain value is displayed below the fader in green letters.

In the lower row, on channel 7, you can see the level of what you are hearing from output 7. The level meter of the hardware output shows the outgoing level. Click into the area above the fader and drag the mouse in order to set the panorama, in this case the routing between channels 7 and 8. The present pan value is also being displayed below the fader.

Please carry out the same steps for Out 2 now, in order to route it to output 8 as well.

In short: While editing the Submix A7/A8 you have direct access to other submixes on other channels, because their routing fields are set to different destinations. And you get a direct view of how their faders and panoramas are set up.

This kind of visual presentation is a mighty one, but for many users it is hard to understand, and it requires a deep understanding of complex routing visualizations. Therefore we usually re-commend to work in Submix View.

Often signals are stereo, i. e. a pair of two channels. It is therefore helpful to be able to make the routing settings for two channels at once. Hold down the Ctrl-key and click into the routing field of Out 3. The routing list pops up with a checkmark at 'A1 3+4'. Select 'A1 7+8'. Now, Out 4 has already been set to 'A1 7+8' as well.

When you want to set the fader to exactly 0 dB, this can be difficult, depending on the mouse configuration. Move the fader close to the 0 position and now press the Shift-key. This activates the fine mode, which stretches the mouse movements by a factor of 8. In this mode, a gain setting accurate to 0.1 dB is no problem at all.

Please set Out 4 to a gain of around -20 dB and the pan close to center. Now click onto the routing field. You'll now see three checkmarks, at 'A1 3+4', 'A1 7+8' and 'SPDIF'. Click onto 'A2 1+2'. The window disappears, fader and pan jump to their initial values, the signal can now be routed to the output A2 1+2. You can continue like this until all entries have got a checkmark, i. e. you can send the signal to all outputs simultaneously.

Page 49

User's Guide HDSP System HDSP 9652 © RME

You will certainly have noticed that the signal at the outputs 7/8 did not change while you were routing channel 4 to other outputs and setting different gain values for those. With all analog and most digital mixing desks, the fader setting would affect the level for every routed bus - not so for TotalMix. TotalMix allows for setting all fader values individually. Therefore the faders and the panpots jump to the appropriate setting as soon as another routing is chosen.

Sometimes you will want the routings not to be independent. Let's say you have sent a signal to several submixes, and now want to change the signal's volume a bit on all these submixes. Dragging the faders by use of the right mouse button activates Post Send mode and causes all routings of the current input or playback channel to be changed in a relative way. Please note that the fader settings of all routings are memorized. So when pulling the fader to the bottom (maximum attenuation), the individual settings are back when you right click the mouse and pull the fader up. The individual settings get lost in m.a. position as soon as the fader is clicked with the left mouse button. As long as no single level is at m.a. position, the left mouse button can be used to change the current routing's gain.

The checkmarks are un-checked by moving the fader to m.a. This setting deactivates the routing...why route if there is no level? Click onto 'A1 7+8' in the routing window, pull the fader down, open the routing window again - the checkmark is gone.

The number of ADAT channels is reduced automatically when entering Double Speed mode (96 kHz). The display is adjusted accordingly, and all fader settings remain stored.

24.5 Submix View

Such a wide range of possibilities make it difficult to maintain the overview. Because as shown practically all hardware outputs can be used for different Submixes, (up to 13 completely independent stereo submixes, 6 4-channel submixes etc.). And when opening the routing windows you might see an army of checkmarks, but you don't get an overview, i.e. how the signals come together and where. This problem is solved by Submix View mode. In this mode, all routing fields jump to the routing pair just being selected. You can then see immediately, which channels, which fader and pan settings make a submix (for example 'A1 7+8'). At the same time the Submix View simplifies setting up the mixer, as all channels can be set simultaneously to the same routing destination with just one click.

Changing to a different destination (output channel) is done in any routing field, or by a click on the desired output pair in the bottom row.

24.6 Mute und Solo

Mute operates pre-fader, thus mutes all currently active routings of the channel. As soon as any Mute button is pressed, the Mute Master button lights up in the Quick Access area. With this all selected mutes can be switched off and on again. You can comfortably make mute-groups or activate and deactivate several Mutes simultaneously.

The same holds true for the Solo and the Solo Master buttons. As with conventional mixing desks, Solo operates only for the output defined as Monitor Main, as a solo-in-place, post fader. As soon as one Solo button is pressed, the Solo Master button lights up in the Quick Access area. With this all selected Solos can be switched off and on again. You can comfortably make solo-groups or activate and deactivate several Solos simultaneously.

Page 50

User's Guide HDSP System HDSP 9652 © RME

24.7 The Quick Access Panel

This section includes additional options, further improving the handling of TotalMix. The Master buttons for Mute and Solo have already been described, they allow for group-based working with these functions.

In the View section the single mixer rows can be made visible or invisible. If the inputs are not needed for a pristine playback mix, the whole upper row falls out of the picture after a click on the Input button. If the hardware outputs don't interest you either, the window can thus be reduced to the playback channels to save space. All combinations are possible and allowed.

As described earlier, Submix sets all routing windows to the same selection. Deactivating Submix automatically recalls the previous view. The mixer can be made smaller horizontally and vertically. This way TotalMix can be made substantially smaller and space-saving on the desktop/screen, if you have to monitor or set only a few channels or level meters.

The Presets are one of the most powerful and us eful features of TotalMix. Be- hind the eight buttons, eight files are hidden (see next chapter). These contain the complete mixer state. All faders and other settings follow the changing of preset(s) in real-time, just by a single mouse click. The Save button allows for storing the present settings in any preset. You can change back and forth between a signal distribution, complete input monitoring, a stereo and mono mix, and various submixes without any problem.

If any parameter is being altered after loading a preset (e. g. moving a fader), the preset display flashes in order to announce that something has been changed, still showing which state the present mix is based on.

If no preset button is lit, another preset had been loaded via the File menu and Open file. Mixer settings can be saved the usual way and have long file names.

Instead of single presets a complete bank of (8) presets can be loaded at once. Advantage: The names defined for the preset buttons will be stored and loaded automatically.

Up to three HDSP 9652 can be used simultaneously. The Unit buttons switch between the cards. Holding down Ctrl while clicking on button Unit 2 or Unit 3 will open another TotalMix window.

24.8 Presets

TotalMix includes eight factory presets, stored within the program. The user presets can be changed at any time, because TotalMix stores and reads the changed presets from the files

preset11.mix to preset81.mix, located in Windows' hidden directory >Documents and Settings, <Username>, Local Settings, Application Data, RME TotalMix<. On the Mac the location is in

the folder >User, <Username>, Library / Preferences / Hammerfall DSP<. The first number indi- cates the current preset, the second number the current unit.

This method offers two major advantages:

• Presets modified by the user will not be overwritten when reinstalling or updating the driver

• The factory presets remain unchanged, and can be reloaded any time.

Page 51

User's Guide HDSP System HDSP 9652 © RME

Mouse: The original factory presets can be reloaded by holding down the Ctrl-key and clicking on any preset button. Alternatively the files described above can be renamed, moved to a different directory, or being deleted.

Keyboard: Using Ctrl and any number between 1 and 8 (not on the numeric keypad) will load the corresponding factory default preset. The key Alt will load the user presets instead.

When loading a preset file, for example 'Main Monitor AN 1_2 plus headphone mix 3_4.mix', the file name will be displayed in the title bar of the TotalMix window. Also when loading a preset by the preset buttons the name of the preset is displayed in the title bar. This way it is always clear what the current TotalMix state is based on.

The eight factory presets offer a pretty good base to modify them to your personal needs. In all factory presets Submix View is active by default.

Preset 1

Description: All channels routed 1:1, monitoring of all playback channels. Details: All inputs maximum attenuation. All playback channels 0 dB, routed to the same output.

All outputs 0 dB. Level display set to RMS +3 dB. View Submix active. Note

: This preset is Default, offering the standard functionality of a I/O-card.

Preset 2

Same as Preset 1.

Preset 3

Description: All channels routed 1:1, input and playback monitoring via outputs. As Preset 1, but all inputs set to 0 dB (1:1 pass through).

Preset 4

Description: All channels routed 1:1, input and playback monitoring via outputs. As Preset 3, but all inputs muted.

Preset 5

Description: All faders maximum attenuation. As Preset 1, but all playbacks maximum attenuation.

Preset 6

Description: Submix on SPDIF at -6 dB. As Preset 1, plus submix of all playbacks on SPDIF.

Preset 7

Description: Submix on SPDIF at -6 dB. As Preset 1, plus submix of all inputs and playbacks on SPDIF.

Preset 8

Description: Panic. As Preset 4, but playback channels muted too (no output signal).

Preset Banks

Instead of a single preset, all eight presets can be stored and loaded at once. This is done via Menu File, Save All Presets as and Open All Presets (file suffix .mpr). After the loading the presets can be activated by the preset buttons. In case the presets have been renamed (see chapter 26.11), these names will be stored and loaded too.

Page 52

24.9 The Monitor Panel

The Monitor panel provides several options usually found on analog mixing desks. It offers quick access to monitoring functions which are needed all the time in typical studio work.

Monitor Main

Use the drop down menu to select the hardware outputs where your main monitors are connected to.

Dim

A click on this button will lower the volume of the Monitor Main output by an amount set up in the Preferences dialog (see below). This is the same as moving the third row faders down a bit, but much more convenient, as the old setting is back by a simple mouse click.

Mono

Sets the stereo output defined above to monaural playback. Useful to check for mono compatibility and phase problems.

Talkback

A click on this button will dim all signals on the Monitor Phones outputs by an amount set up in the Preferences dialog. At the same time the control room's microphone signal (source defined in Preferences) is sent to the three destinations Monitor Phones described below. The microphone level is adjusted with the channel's input fader.

Monitor Phones 1/2/3

Use the drop down menu to select the hardware outputs where the submixes are sent to. These submixes are usually phones mixdowns for the musicians. A click on the button allows for the monitoring of the specific submix via the Monitor Main output. So when setting up or modifying the submix for the musician this process can be monitored easily and any time.

24.10 Preferences

The dialog box Preferences is available via the menu Options or directly via F3.

Talkback

Input: Select the input channel of the Talkback signal (microphone in control room). Dim: Amount of attenuation of the signals routed to the Monitor Phones in dB.

Listenback

Input: Select the input channel of the Listenback signal (microphone in recording room). Dim: Amount of attenuation of the signals routed to the Monitor Main in dB.

Note

: The Mute button of the Talkback and Listenback channel is still active. Therefore it is not necessary to select <NONE>, in case one of both shall be deactivated.

MIDI Controller, Full LC Display Support

See chapter 27.3 and 27.4 for details.

Page 53

Monitor Main

Dim: Amount of attenuation of the Monitor Main output in dB. Activated by the Dim button in the Monitor panel.

Stereo Pan Law

The Pan Law can be set to -6 dB, -4.5 dB, -3 dB and 0 dB. The value chosen defines the level attenuation in pan center position. This setting is useful because the ASIO host often supports different pan laws too. Selecting the same value here and in the ASIO host, ASIO Direct Monitoring works perfectly, as both ASIO host and TotalMix use the same pan law. Of course, when not using ADM it can be changed to a setting different from the factory preset of –6 dB as well. You will most probably find that -3 dB gives a much more stable loudness when moving an object between left and right.

24.11 Editing the Names

The channel names shown in the grey label area can be edited. A right mouse click on the grey name field brings up the dialog box Enter Name. Any name can be entered in this dialog. Enter/Return closes the dialog box, the grey label now shows the first letters of the new name. ESC cancels the process and closes the dialog box.

Moving the mouse over the label brings up a tool tip with the complete name.

The hardware outputs (third row) can be edited in the same way. In this case, the names in the routing drop down menus will change automatically. Additionally the names in the drop down menus of the Monitor section will change as well.

The preset buttons can get meaningful names in the same way. Move the mouse over a preset button, a right mouse click will bring up the dialog box.

Note that the name shows up as tool tip only, as soon as the mouse stays over the preset button.

The preset button names are not stored in the preset files, but globally in the registry, so won't change when loading any file or saving any state as preset. But loading a preset bank (see chapter 24.8) the names will be updated.

Page 54

24.12 Hotkeys

In many situations TotalMix can be controlled quickly and comfortably by the keyboard, making the mixer setup considerably easier and faster. The Shift-key for the fine mode for faders and panpots has already been mentioned. The Ctrl-key can do far more than changing the routing pairwise:

• Clicking anywhere into the fader area with the Ctrl-key pressed, sets the fader to 0 dB.

• Clicking anywhere into the pan area with the Ctrl-key pressed, sets the panorama to <C>

meaning Center.

• Clicking a preset button while holding down Ctrl, the original factory preset will be loaded.

• Using Ctrl and any number between 1 and 8 (not on the numeric keypad!) will load the cor-

responding factory default preset. Alt plus number loads the user preset.

• Using multiple HDSP 9652, clicking the button Unit 2 while holding down Ctrl opens a sec-

ond TotalMix window for the second HDSP system, instead of replacing the window contents.

The faders can also be moved pairwise, corresponding to the stereo-routing settings. This is achieved by pressing the Alt-key and is especially comfortable when setting the stereo monitor output level. Even the panoramas can be operated with Alt, from stereo through mono to inversed channels, and also the Mute and Solo buttons (ganged or inversed switching!).

At the same time, TotalMix also supports combinations of these keys. If you press Ctrl and Alt at the same time, clicking with the mouse makes the faders jump to 0 dB pairwise, and they can be set pairwise by Shift-Alt in fine mode.

Also very useful: the faders have two mouse areas. The first area is the fader button, which can be grabbed at any place without changing the current position. This avoids unwanted changes when clicking onto it. The second area is the whole fader setting area. Clicking into this area makes the fader jump to the mouse at once. If for instance you want to set several faders to m.a., it is sufficient to click onto the lower end of the fader path. Which happens pairwise with the Alt-key pressed.

Using the hotkeys I, O and P the complete row of Input, Playback and Output channels each can be toggled between visible and invisible. Hotkey S switches Submix view on/off. Those four hotkeys have the same functionality as the buttons in the View section of the Quick Access Panel. The Level Meter Setup dialog can be opened via F2 (as in DIGICheck). The dialog box Preferences is opened via F3.

Hotkey M toggles Mute Master on/off (and with this performs a global mute on/off). Hotkey X toggles the Matrix view on/off (see chapter 25), hotkey T the mixer view. Hotkey L links all faders as stereo pairs.

Further hotkeys are available to control the configuration of the Level Meter (see chapter

24.14): Key 4 or 6: Display range 40 or 60 dB

Key E or R: Numerical display showing Peak or RMS Key 0 or 3: RMS display absolute or relative to 0 dBFS

Page 55

24.13 Menu Options

Always on Top: When active (checked) the TotalMix window will always be on top of the Win-

dows desktop. Note

: This function may result in problems with windows containing help text, as the TotalMix

window will even be on top of those windows, so the help text isn't readable. Deactivate Screensaver: When active (checked) any activated Windows screensaver will be

disabled temporarily. Ignore Position: When active, the windows size and position stored in a file or preset will not

be used. The routing will be activated, but the window will not change. Ignore I/O Labels: When active the channel names saved in a preset or file will not be loaded,

instead the current ones will be retained. ASIO Direct Monitoring (Windows only): When de-activated any ADM commands will be

ignored by TotalMix. In other words, ASIO Direct Monitoring is globally de-activated. Link Faders: Selecting this option all faders will be treated as stereo pairs and moved pair-

wise. Hotkey L.

Level Meter Setup: Configuration of the Level Meters. Hotkey F2. See chapter 24.14. Level Meter Text Color: Colour adjustment for the Gain and Level meter text displays. Default:

Hue 110, Saturation 225, Brightness 135. Preferences: Opens a dialog box to configure several functions, like Pan Law, Dim, Talkback

Dim, Listenback Dim. See chapter 26.10. Enable MIDI Control: Turns MIDI control on. The channels which are currently under MIDI

control are indicated by a colour change of the info field below the faders, black turns to yellow. Deactivate MIDI in Background: Disables the MIDI control as soon as another application is in

the focus, or in case TotalMix has been minimized. Lock Mixer: Opens a dialog box for password entry. Changes on the mixer have no effect any-

more until the mixer is unlocked in the same way, by entering the password a second time. The password is stored unencrypted in the registry (Windows: Software, RME, hdspmix, Password).

Page 56

24.14 Level Meter

The HDSP 9652 calculates all the display values Peak, Over and RMS in hardware, in order to be capable of using them independent of the software in use, and to significantly reduce the CPU load.

Tip: This feature, the Hardware Level Meter, is used by DIGICheck (see chapter 16) to display Peak/RMS level meters of all channels, nearly without any CPU load.

The level meters integrated in TotalMix - considering their size - cannot be compared with DIGICheck. Nevertheless they already include many useful functions.

Peak and RMS is displayed for every channel. 'Level Meter Setup' (menu Options or F2) and direct keyboard entry (hotkeys) make various options available:

• Display range 40 or 60 dB (hotkey 4 or 6)

• Release time of the Peak display (Fast/Medium/Slow)

• Numerical display selectable either Peak or RMS (Hotkey E or R)

• Number of consecutive samples for Overload display (1 to 15)

• RMS display absolute or relative to 0 dBFS (Hotkey 3 or 0)

The latter is a point often overlooked, but nonetheless important. A RMS measurement shows 3 dB less for sine signals. While this is mathematically correct, it is not very reasonable for a level meter. Therefore the RMS readout is usually corrected by 3 dB, so that a full scale sine signal shows 0 dBFS on both Peak and RMS meters.

This setting also yields directly readable signalto-noise values. Otherwise the value shown with noise is 3 dB better than it actually is (because the reference is not 0 dB, but -3 dB).

The value displayed in the text field is independent of the setting 40/60 dB, it represents the full 24 bit range of the RMS measurement. An example: An RME ADI-8 QS connected to the HDSP 9652's ADAT port will cause a level readout of around -114 dBFS on all eight channel's input level meters.

This level display of TotalMix also provides means for a constant monitoring of the signal quality. Thus it can be a valuable tool for sound optimization and error removal in the studio.

Measuring SNR (Signal to Noise) is best done with RME’s free software DIGICheck. The function Bit Statistic includes three different RMS meters for exactly this purpose (RMS unweighted, A-weighted and DC).

Page 57

25. TotalMix: The Matrix

25.1 Overview

The mixer window of TotalMix looks and operates similar to mixing desks, as it is based on a conventional stereo design. The matrix display presents a different method of assigning and routing channels, based on a single channel or monaural design. The matrix view of the HDSP has the looks and works like a conventional patchbay, adding functionality way beyond comparable hardware and software solutions. While most patchbays will allow you to connect inputs to outputs with just the original level (1:1, or 0 dB, as known from mechanical patchbays), TotalMix allows you to use a freely definable gain value per crosspoint.

Matrix and TotalMix are different ways of displaying the same processes. Because of this both views are always fully synchronized. Each change in one view is immediately reflected in the other view as well.

25.2 Elements of the Matrix View

The visual design of the TotalMix Matrix is mainly determined by the architecture of the HDSP system:

• Horizontal labels: All hardware outputs

• Vertical labels: All hardware inputs. Below are all play-

back channels (software playback channels)

• Green 0.0 dB field: Standard 1:1 routing

• Black gain field: Shows the current gain value as dB

• Orange gain field: This routing is muted.

To maintain overview when the window size has been reduced, the left and upper labels are floating. They won't leave the visible area when scrolling.

25.3 Operation

Using the Matrix is a breeze. It is very easy to indentify the current crosspoint, because the outer labels light up in orange according to the mouse position.

If input 1 is to be routed to output 1, use the mouse and click one time on crosspoint In 1 / A 1. The green 0.0 dB field pops in, another click removes it. To change the gain (equals the use of a different fader position, see simultaneous display of the mixer view), hold Ctrl down and drag the mouse up or down, starting from the gain field. The value within the field changes accordingly. The corresponding fader in the mixer view is moving simultaneously, in case the currently modified routing is visible.

Note the difference between the left side, representing the inputs and software playback channels, and the upper side, representing the hardware outputs. Moving a fader in row 1 or 2 in TotalMix view, only the specific levels (max. 2) of this routing will change within the Matrix. But moving a fader in row 3 will make all vertically activated levels move at once (for example 27/28, Phones output).

A gain field marked orange indicates activated mute status. Mute can only be changed in the mixer view.

Page 58

25.4 Advantages of the Matrix

The Matrix not always replaces the mixer view, but it significantly enhances the routing capabilities and - more important - is a brilliant way to get a fast overview of all active routings. It shows you in a glance what's going on. And since the Matrix operates monaural, it is very easy to set up specific routings with specific gains.

Example 1: You want TotalMix to route all software outputs to all corresponding hardware outputs, and have a submix of all inputs and software outputs on the Phones output (equals factory preset 2). Setting up such a submix is easy. But how to check at a later time, that all settings are still exactly the way you wanted them to be, not sending audio to a different output?

The most effective method to check a routing in mixer view is the Submix View, stepping through all existing software outputs, and having a very concentrated look at the faders and displayed levels of each routing. That doesn't sound comfortably nor error-free, right? Here is where the Matrix shines. In the Matrix view, you simply see a line from upper left to lower right, all fields marked as unity gain. Plus two rows vertically all at the same level setting. You just need 2 seconds to be sure no unwanted routing is active anywhere, and that all levels match precisely!

Example 2: The Matrix allows you to set up routings which would be nearly impossible to achieve by fiddling around with level and pan. Let's say you want to send input 1 to output 1 at 0 dB, to output 2 at -3 dB, to output 3 at -6 dB and to output 4 at -9 dB. Each time you set up the right channel (2/4), the change in pan destroys the gain setting of the left channel (1/2). A real hassle! In Matrix view, you simply click on the corresponding routing point, set the level via Ctrlmouse, and move on. You can see in TotalMix view how pan changes to achieve this special gain and routing when performing the second (fourth...) setting.

26. TotalMix Super-Features

26.1 ASIO Direct Monitoring (Windows only)

Start Samplitude, Sequoia, Cubase or Nuendo and TotalMix. Activate ADM (ASIO Direct Monitoring), and move a fader in the ASIO host. Now watch the corresponding fader in TotalMix magically move too. TotalMix reflects all ADM gain and pan changes in real-time. Please note that faders only move when the currently activated routing (currently visible routing) corresponds to the one in the ASIO host. Also note that the Matrix will show any change, as it shows all possible routings in one view.

With this TotalMix has become a wonderful debugging tool for ADM. Just move the host's fader and pan, and see what kind of ADM commands TotalMix receives.

The hardware output row faders are included in all gain calculations, in every possible way. Example: you have lowered the output level of a submix, or just a specific channel, by some dB. The audio signal passed through via ADM will be attenuated by the value set in the third row.

Page 59

26.2 Selection and Group-based Operation

Click on the white name label of channel 1 and 2 in TotalMix. Be sure to have channel 3's fader set to a different position and click on its label too. All three labels have changed to the colour orange, which means they are selected. Now moving any of these faders will make the other faders move too. This is called 'building a group of faders', or ganging faders, maintaining their relative position.

Building groups or ganging can be done in any row, but is limited to operate horizontally within one row. If you usually don't need this, you can at least gang the analog outputs. The advantage over holding the Alt-key is that Alt sets both channels to the same level (can be handy too), while grouping via selection will retain any offset (if you need one channel to be louder all the time etc.).

Note

: The relative positions are memorized until the faders are pulled down so that they reach upper or lower maximum position and the group is changed (select another channel or deselect one of the group).

26.3 Copy Routings to other Channels

TotalMix allows to copy complete routing schemes of inputs and outputs. Example 1: You have input 1 (guitar) routed within several submixes/hardware outputs (=

headphones). Now you'll get another input with keyboards that should appear in the same way on all headphones. Select input 1, open the menu Edit. It shows 'Copy In 1'. Now select the desired new input, for example In 8. The menu now shows 'Paste In 1 to In 8'. Click on it - done. If you are familiar with this functionality just use Ctrl-C and Ctrl-V. Else the self updating menu will always let you know what actually will happen.

Tip: Have the Matrix window open as second window when doing this. It will show the new routings immediately, so copying is easier to understand and to follow.

Example 2: You have built a comprehensive submix on outputs 4/5, but now need the exact same signal also on the outputs 6/7. Click on Out 4, Ctrl-C, click on Out 6, Ctrl-V, same with 5/7

- you're done! The Matrix shows you the difference between both examples. Example 1 means copying lines

(horizontally), while example 2 means copying rows (vertically). Example 3: Let's say the guitarist finished his recording, and you now need the same signal

again on all headphones, but this time it comes from the recording software (playback row). No problem, you can even copy between rows 1 and 2 (copying between row 3 and 1/2 isn't possible).

But how to select while a group is active? De-selecting the group first? Not necessary! TotalMix always updates the copy and paste process with the last selection. This way you don't have to de-activate any group-selections when desiring to perform a copy and paste action.

26.4 Delete Routings

The fastest way to delete complex routings: select a channel in the mixer view, click on the menu entry Edit and select Delete. Or simply hit the Del-key. Attention: there is no undo in To- talMix, so be careful with this function!

Page 60

26.5 Recording a Subgroup (Loopback)

TotalMix supports a routing of the subgroup outputs (=hardware outputs, bottom row) to the recording software. Unfortunately this feature is not available with the HDSP 9652, as the FPGA of the card has no resources left for a hardware implementation. Therefore this chapter describes the loopback mode when used with an external cable loop.

A loopback is used to record the playback signal. This way, complete submixes can be recorded, the playback of a software can be recorded by another software, and several input signals can be mixed into one record channel. Please note these important issues:

The connection of digital output and input generates a clock loop, and with this a malfunction, in case the card has not been switched into clock mode Master, or an external clock signal of highest priority is used.

The latter is the case when the card is in AutoSync mode, and is synchronized by an external clock signal from the input selected in Pref Sync Ref. For example set up a loopback cabling with SPDIF or ADAT3, but clock the HDSP 9652 via input ADAT1.

Connecting digital output and input can cause a digital feedback, which is more severe than any analog one. Caution!

This is a problem for both TotalMix (monitoring an input signal to the same output channel) and the DAW software (which usually activates monitoring in the same way).

Recording a Software's playback

In real world application, recording a software's output with another software will show the following problem: The record software tries to open the same playback channel as the playback software (already active), or the playback one has already opened the input channel which should be used by the record software.

This problem can easily be solved. First make sure that all rules for proper multi-client operation are met (not using the same record/playback channels in both programs). Then route the playback signal via TotalMix to a hardware output in the range of the record software, and send it to the record software via the loopback cable.

Mixing several input signals into one record channel

In some cases it is useful to record several sources in only one track. For example when using two microphones when recording instruments and loudspeakers, TotalMix loopback saves an external mixing desk. Simply route/mix the input signals all to the same output (third row), then send this output to a record channel via the loopback cable. This way any number of input channels from different sources can be recorded into one single track.

Note

: The data recorded using the loopback cable is delayed by about 3 samples. This value is extremely low, because the HDSP 9652 provides digital interfacing only. And therefore the additional delay can simply be ignored.

Page 61

26.6 Using external Effects Devices

With TotalMix a usage of external hardware - like effects devices - is easy and flexible. Example 1: The singer (microphone input channel 1) shall have some reverb on his head-

phones (outputs 25/26). A direct routing In 1 to Out 25/26 for monitoring had been set up already. The external reverb is connected to a free output, for example channel 8. In active mode Submix View click on channel 8 in the bottom row. Drag the fader of input 1 to about 0 dB and the panorama fully to the right. Adjust the input level at the reverb unit to an optimal setting. Next the output of the reverb unit is connected to a free stereo input, for example 5/6. Use the TotalMix level meters to adjust a matching output level at the reverb unit. Now click on channels 25/26 in the bottom row, and move the fader of inputs 5/6 until the reverb effect gets a bit too loud in the headphones. Now click on channel 8 in the bottom row again and drag fader 1 down a bit until the mix of original signal and reverb is perfect for the singer.

The described procedure is completely identical to the one when using an analog mixing desk. There the signal of the singer is sent to an output (usually labelled Aux), from there to a reverb unit, sent back from the reverb unit as stereo wet signal (no original sound), back in through a stereo input (e.g. Effect return) and mixed to the monitoring signal. The only difference: The Aux sends on mixing desks are post-fader. Changing the level of the original signal causes a change of the effects level (here the reverb) too, so that both always have the same ratio.

Tip: Such a functionality is available in TotalMix via the right mouse button! Dragging the faders by use of the right mouse button causes all routings of the current input or playback channel to be changed in a relative way. This completely equals the function Aux post fader.

Example 2: Inserting an effects device can be done as above, even within the record path. Other than in the example above the reverb unit also sends the original signal, and there is no routing of input 1 directly to outputs 25/26. To insert an effects device like a Compressor/Limiter directly into the record path, the input signal of channel 1 is sent by TotalMix to any output, to the Compressor, back from the Compressor to any input. This input is now selected within the record software.

Page 62

27. TotalMix MIDI Remote Control

27.1 Overview

TotalMix can be remote controlled via MIDI. It is compatible to the widely spread Mackie Control protocol, so TotalMix can be controlled with all hardware controllers supporting this standard. Examples are the Mackie Control, Tascam US-2400 or Behringer BCF 2000.

Additionally, the stereo output faders (lowest row) which are set up as Monitor Main outputs in the Monitor panel can also be controlled by the standard Control Change Volume via MIDI channel 1. With this, the main volume of the HDSP 9652 is controllable from nearly any MIDI equipped hardware device.

27.2 Mapping

TotalMix supports the following Mackie Control surface elements*: Element: Meaning in TotalMix: Channel faders 1 – 8 volume

Master fader Main Monitor channel's faders SEL(1-8) + DYNAMICS reset fader to Unity Gain V-Pots 1 – 8 pan pressing V-Pot knobs pan = center

CHANNEL LEFT or REWIND move one channel left CHANNEL RIGHT or FAST FORWARD move one channel right BANK LEFT or ARROW LEFT move eight channels left BANK RIGHT or ARROW RIGHT move eight channels right ARROW UP or Assignable1/PAGE+ move one row up ARROW DOWN or Assignable2/PAGE- move one row down

EQ Master Mute PLUGINS/INSERT Master Solo STOP Dim Main Monitor PLAY Talkback PAN Mono Main Monitor

MUTE Ch. 1 – 8 Mute SOLO Ch. 1 – 8 Solo SELECT Ch. 1 – 8 Select REC Ch. 1 – 8 in Submix mode only: select output bus

F1 - F8 load preset 1 - 8 F9 select Main Monitor F10 - F12 Monitor Phones 1 - 3

*Tested with Behringer BCF2000 Firmware v1.07 in Mackie Control emulation for Steinberg mode and with Mackie Control under Mac OS X.

Page 63

27.3 Setup

• Open the Preferences dialog (menu Options or F3). Select the MIDI Input and MIDI Output port where your controller is connected to.

• When no feedback is needed (when using only standard MIDI commands instead of Mackie Control protocol) select NONE as MIDI Output.

• Check Enable MIDI Control in the Options menu.

27.4 Operation

The channels being under MIDI control are indicated by a colour change of the info field below the faders, black turns to yellow.

The 8-fader block can be moved horizontally and vertically, in steps of one or eight channels. Faders can be selected to gang them. In Submix View mode, the current routing destination (output bus) can be selected via REC Ch.

1 – 8. This equals the selection of a different output channel in the lowest row by a mouse click when in Submix View. In MIDI operation it is not necessary to jump to the lowest row to perform this selection. This way even the routing can be easily changed via MIDI.

Full LC Display Support: This option in Preferences (F3) activates complete Mackie Control LCD support with eight channel names and eight volume/pan values.

Attention: this feature causes heavy overload of the MIDI port when ganging more than 2 faders! In such a case, or when using the Behringer BCF2000, turn off this option.

When Full LC Display Support is turned off, only a brief information about the first fader of the block (channel and row) is sent. This brief information is also available on the LED display of the Behringer BCF2000.

Tip for Mac OS X users: LC Xview (www.opuslocus.com

) provides an on-screen display emulating the hardware displays of a Logic/Mackie Control, for use with controllers that can emulate a Logic/Mackie Control but do not have a display. Examples include the Behringer BCF2000 and Edirol PCR-series.

Deactivate MIDI in Background (menu Options) disables the MIDI control as soon as another application is in the focus, or in case TotalMix has been minimized. This way the hardware controller will control the main DAW application only, except when TotalMix is in the foreground. Often the DAW application can be set to become inactive in background too, so that MIDI control is switched between TotalMix and the application automatically when switching between both applications.

TotalMix also supports the 9th fader of the Mackie Control. This fader (labelled Master) will control the stereo output faders (lowest row) which are set up as Main Monitor outputs in the Monitor panel. Always and only.

Page 64

27.5 Simple MIDI Control

The stereo output faders (lowest row) which are set up as Monitor Main outputs in the Monitor panel can also be controlled by the standard Control Change Volume via MIDI channel 1. With this, the main volume of the HDSP 9652 is controllable from nearly any MIDI equipped hardware device.

Even if you don't want to control all faders and pans, some buttons are highly desired to be available in 'hardware'. These are mainly the Talkback and the Dim button, and the new monitoring options (listen to Phones submixes). Fortunately a Mackie Control compatible controller is not required to control these buttons, as they are steered by simple Note On/Off commands on MIDI channel 1.

The notes are (hex / decimal / keys):

Monitor Main: 3E / 62 / D 3 Dim: 5D / 93 / A 5 Mono: 2A / 42 / #F 1 Talkback: 5E / 94 / #A 5

Monitor Phones 1: 3F / 63 / #D 3 Monitor Phones 2: 40 / 64 / E 3 Monitor Phones 3: 41 / 65 / F 3

Preset 1: 36 / 54 / #F 2 Preset 2: 37 / 55 / G 2 Preset 3: 38 / 56 / #G 2 Preset 4: 39 / 57 / A 2 Preset 5: 3A / 58 / #A 2 Preset 6: 3B / 59 / B 2 Preset 7: 3C / 60 / C 3 Preset 8: 3D / 61 / #C 3

An example of a small MIDI controller covering such MIDI functionality (and even some more) is the Behringer BCN44. This little box has 4 pots and 8 buttons for all the above functions – for less than 60 Euros.

Furthermore TotalMix allows you to control all faders of all three rows via simple Control Change commands.

The format for the Control Change commands is: Bx yy zz x = MIDI channel

yy = control number zz = value

The first row in TotalMix is addressed by MIDI channels 0 up to 3, the middle row by channels 4 up to 7 and the bottom row by channels 8 up to 11.

16 Controller numbers are used: 102 up to 117 (= hex 66 to 75). With these 16 Controllers (= faders) and 4 MIDI channels each per row, up to 64 faders can be

controlled per row (as required by the HDSP MADI).

Page 65

Examples for sending MIDI strings*:

- Set input 1 to 0 dB: B0 66 40

- Set input 17 to maximum attenuation: B1 66 0

- Set playback 1 to maximum: B4 66 7F

- Set Output 16 to 0 dB: B8 75 40 *Note

: Sending MIDI strings might require the use of programmer's logic for the MIDI channel,

starting with 0 for channel 1 and ending with 15 for channel 16.

27.6 Loopback Detection

The Mackie Control protocol requires feedback of the received commands, back to the hardware controller. So usually TotalMix will be set up with both a MIDI input and MIDI output. Unfortunately any small error in wiring and setup will cause a MIDI feedback loop here, which then completely blocks the computer (the CPU).

To prevent the computer from freezing, TotalMix sends a special MIDI note every 0.5 seconds to its MIDI output. As soon as it detects this special note at the input, the MIDI functionality is disabled. After fixing the loopback, check Enable MIDI Control under Options to reactivate the TotalMix MIDI.

Page 66

Page 67

User's Guide

HDSP 9652

Technical Reference

Page 68

28. Tech Info

Not all information to and around our products fit in a manual. Therefore RME offers a lot more and detailed information in the Tech Infos. The very latest Tech Infos can be found on our website, section Support. These are some of the currently available Tech Infos:

Synchronization II (DIGI96 series) Digital audio synchronization - technical background and pitfalls.

Installation problems - Problem descriptions and solutions. Driver updates Hammerfall DSP – Lists all changes of the driver updates. DIGICheck: Analysis, tests and measurements with RME audio hardware

A description of DIGICheck, including technical background information. ADI-8 Inside

Technical information about the RME ADI-8 (24-bit AD/DA converter). Many background information on laptops and tests of notebooks:

HDSP System: Notebook Basics - Notebook Hardware HDSP System: Notebook Basics - The Audio Notebook in Practice HDSP System: Notebook Basics - Background Knowledge and Tuning HDSP System: Notebook Tests - Compatibility and Performance

The digital mixer of the Hammerfall DSP in theory and practise HDSP System: TotalMix - Hardware and Technology HDSP System: TotalMix - Software, features, operation

Page 69

29. Technical Specifications

29.1 Digital Inputs

SPDIF - AES/EBU

• 1 x RCA, transformer-balanced, galvanically isolated, according to AES3-1992

• High-sensitivity input stage (< 0.3 Vpp)

• SPDIF compatible (IEC 60958)

• Accepts Consumer and Professional format, copy protection will be ignored

• Lock range: 28 kHz – 103 kHz

• Jitter when synced to input signal: < 3 ns

ADAT Optical

• 3 x TOSLINK, format according to Alesis specification

• Standard: 24 channels 24 bit, up to 48 kHz

• Double Speed (S/MUX): 12 channels 24 bit 96 kHz

• Bitclock PLL ensures perfect synchronisation even in varispeed operation

• Lock range: 31.5 kHz – 50 kHz

• Jitter when synced to input signal: < 3 ns

Word Clock

• BNC, not terminated (10 kOhm)

• Automatic Double Speed detection and internal conversion to Single Speed

• Not affected by DC-offsets within the network

• Overvoltage protection

• Level range: 1.0 Vpp – 5.6 Vpp

• Lock Range: 28 kHz – 103 kHz

• Jitter when synced to input signal: < 3 ns

29.2 Digital Outputs

SPDIF - AES/EBU

• 1 x RCA, transformer-balanced, galvanically isolated, according to AES3-1992

• Output level Professional 2.3 Vpp, Consumer 1.0 Vpp

• Format Professional according to AES3-1992 Amendment 4

• Format Consumer (SPDIF) according to IEC 60958

• Single Wire mode, sample rate 28 kHz up to 103 kHz

ADAT

• 3 x TOSLINK

• Standard: 24 channels 24 bit, up to 48 kHz

• Double Speed (S/MUX): 12 channels 24 bit 96 kHz

Word Clock

• BNC, max. output voltage: 5 Vpp

• Output voltage @ 75 Ohm termination: 4.0 Vpp

• Output impedance: 10 Ohm

• Frequency range: 27 kHz – 103 kHz

Page 70

29.3 Digital

• Low Jitter Design: < 3 ns external clock, < 1 ns internal clock

• Internal sample rates: 32 / 44.1 / 48 / 88.2 / 96 kHz

• Supported sample rates through word clock: 28 kHz - 103 kHz

• Internal resolution: 24 bit

• Input PLL ensures zero dropout, even at more than 40 ns jitter

• Bitclock PLL for trouble-free varispeed ADAT operation

• Ground-free digital inputs and outputs

29.4 MIDI

• 2 x MIDI I/O via 5-pin DIN jacks

• Galvanically isolated by optocoupled input

• Hi-speed mode: Jitter and response time typically below 1 ms

• Separate 128 byte FIFOs for input and output

Page 71

30. Technical Background

30.1 Lock and SyncCheck

Digital signals consist of a carrier and the data. If a digital signal is applied to an input, the receiver has to synchronize to the carrier clock in order to read the data correctly. To achieve this, the receiver uses a PLL (Phase Locked Loop). As soon as the receiver meets the exact frequency of the incoming signal, it is locked. This Lock state remains even with small changes of the frequency, because the PLL tracks the receiver's frequency.

If an ADAT or SPDIF signal is applied to the HDSP 9652, the unit indicates LOCK, i. e. a valid input signal. This information is presented in the HDSP 9652's Settings dialog. In the status display SyncCheck, the state of all clocks is decoded and shown as simple text (No Lock, Lock, Sync).

Unfortunately, LOCK does not necessarily mean that the received signal is correct with respect to the clock which processes the read out of the embedded data. Example [1]: The HDSP 9652 is set to 44.1 kHz internally (clock mode Master), and a mixing desk with ADAT output is connected to input ADAT1. The status display will show LOCK immediately, but usually the mixing desk's sample rate is generated internally (it is Master too), and thus slightly higher or lower than the HDSP 9652's internal sample rate. Result: When reading out the data, there will frequently be read errors that cause clicks and drop outs.

Also when using multiple inputs, a simple LOCK is not sufficient. The above described problem can be solved elegantly by setting the HDSP 9652 from Master to AutoSync (its internal clock will then be the clock delivered by the mixing desk). But in case another un-synchronous device is connected, there will again be a slight difference in the sample rate, and therefore clicks and drop outs.

In order to display those problems, the HDSP 9652 includes SyncCheck

. It checks all clocks used for synchronicity. If they are not synchronous to each other, the status display will show LOCK. If they are synchronous to each other (i. e. absolutely identical) the status display will change to SYNC. In example 1 it would have been obvious that the entry LOCK is shown in SyncCheck right after connecting the mixing desk.

In practice, SyncCheck allows for a quick overview of the correct configuration of all digital devices. So one of the most difficult and error-prone topics of the digital studio world finally becomes easy to handle.

Page 72

30.2 Latency and Monitoring

The term Zero Latency Monitoring has been introduced by RME in 1998 for the DIGI96 series of audio cards. It stands for the ability to pass-through the computer's input signal at the interface directly to the output. Since then, the idea behind has become one of the most important features of modern hard disk recording. In the year 2000, RME published two ground-breaking Tech Infos on the topics Low Latency Background, which are still up-to-date: Monitoring, ZLM and ASIO, and Buffer and Latency Jitter, both found on the RME website.

How much Zero is Zero?

From a technical view there is no zero. Even the analog pass-through is subject to phase errors, equalling a delay between input and output. However, delays below certain values can subjectively be claimed to be a zero-latency. This applies to analog routing and mixing, and in our opinion also to RME's Zero Latency Monitoring. The term describes the digital path of the audio data from the input of the interface to its output. The digital receiver of the HDSP 9652 can't operate un-buffered, and together with TotalMix and the output via the transmitter, it causes a typical delay of 3 samples. At 44.1 kHz this equals about 68 µs (0.000068 s). In Double Speed mode, the delay doubles to 6 samples, for both ADAT and SPDIF.

Oversampling

While the delays of digital interfaces can be disregarded altogether, the analog inputs and outputs do cause a significant delay. Modern converter chips operate with 64 or 128 times oversampling plus digital filtering, in order to move the error-prone analog filters away from the audible frequency range as far as possible. This typically generates a delay of one millisecond. A playback and re-record of the same signal via DA and AD (loopback) then causes an offset of the newly recorded track of up to 2 ms.

Buffer Size (Latency) Windows: This option found in the Settings dialog defines the size of the buffers for the audio data used in ASIO and GSIF (see chapter 13 and 14).

Mac OS X: The buffer size is defined within the application. Only some do not offer any setting. For example iTunes is fixed to 512 samples.

General: A setting of 64 samples at 44.1 kHz causes a latency of 1.5 ms, for record and playback each. But when performing a digital loopback test no latency/offset can be detected. The reason is that the software naturally knows the size of the buffers, therefore is able to position the newly recorded data at a place equalling a latency-free system.

AD/DA Offset under ASIO and OS X: ASIO (Windows) and Core Audio (Mac OS X) allow for the signalling of an offset value to correct buffer independent delays, like AD- and DA-conversion or the Safety Buffer described below. An analog loopback test will then show no offset, because the application shifts the recorded data accordingly.

Because the HDSP 9652 is a completely digital interface, and the delays introduced by external AD/DA-converters are unknown to unit and driver, the drivers include the digital offset values (3 / 6 samples). Therefore the delays caused by external converters have to be taken care off in the record software, which usually means that the user has to enter specific offset values manually.

Note

: Cubase and Nuendo display the latency values signalled from the driver separately for record and playback. These values equal nearly exactly the buffer size (for example 3 ms at 128 samples) on RME's digital interfaces.

Core Audio Safety Offset

Under OS X, every audio interface has to use a so called safety offset, otherwise Core Audio won't operate click-free. The HDSP 9652 uses a safety offset of 32 samples. This offset is signalled to the system, and the software can calculate and display the total latency of buffer size plus safety offset for the current sample rate.

Page 73

30.3 DS - Double Speed

When activating the Double Speed mode the HDSP 9652 operates at double sample rate. The internal clock 44.1 kHz turns to 88.2 kHz, 48 kHz to 96 kHz. The internal resolution is still 24 bit.

Sample rates above 48 kHz were not always taken for granted, and are still not widely used because of the CD format (44.1 kHz) dominating everything. Before 1998 there were no receiver/transmitter circuits available that could receive or transmit more than 48 kHz. Therefore a work-around was used: instead of two channels, one AES line only carries one channel, whose odd and even samples are being distributed to the former left and right channels. By this, you get the double amount of data, i. e. also double sample rate. Of course in order to transmit a stereo signal two AES/EBU ports are necessary then.

This transmission mode is called Double Wire in the professional studio world, and is also known as S/MUX (abbreviation for Sample Multiplexing) in connection with the ADAT format. The AES3 specification uses the uncommon term Single channel double sampling frequency mode.

Not before February 1998, Crystal shipped the first 'single wire' receiver/transmitters that could also work with double sample rate. It was then possible to transmit two channels of 96 kHz data via one AES/EBU port.

But Double Wire is still far from being dead. On one hand, there are still many devices which can't handle more than 48 kHz, e. g. digital tape recorders. But also other common interfaces like ADAT or TDIF are still using this technique.

Because the ADAT interface does not allow for sampling frequencies above 48 kHz (a limitation of the interface hardware), the HDSP 9652 automatically uses the Sample Multiplexing method in DS mode. One channel's data is distributed to two channels according to the following table:

ADAT Ch. 1 2 3 4 5 6 7 8 DS Channel Samples

As the transmission of double rate signals is done at standard sample rate (Single Speed), the ADAT outputs still deliver 44.1 kHz or 48 kHz.

Page 74

30.4 AES/EBU - SPDIF

The most important electrical properties of 'AES' and 'SPDIF' can be seen in the table below. AES/EBU is the professional balanced connection using XLR plugs. The standard is being set by the Audio Engineering Society based on the AES3-1992. For the 'home user', SONY and Philips have omitted the balanced connection and use either Phono plugs or optical cables (TOSLINK). The format called S/P-DIF (SONY/Philips Digital Interface) is described by IEC

60958.

Type AES3-1992 IEC 60958

Connection XLR RCA / Optical Mode Balanced Un-balanced Impedance 110 Ohm 75 Ohm Level 0.2 V up to 5 Vss 0.2 V up to 0.5 Vss Clock accuracy not specified

I: ± 50ppm II: 0,1% III: Variable Pitch

Jitter < 0.025 UI (4.4 ns @ 44.1 kHz) not specified

Besides the electrical differences, both formats also have a slightly different setup. The two formats are compatible in principle, because the audio information is stored in the same place in the data stream. However, there are blocks of additional information, which are different for both standards. In the table, the meaning of the first byte (#0) is shown for both formats. The first bit already determines whether the following bits should be read as Professional or Consumer information.

Byte Mode Bit 0 1 2 3 4 5 6 7

0 Pro P/C Audio? Emphasis Locked Sample Freq. 0 Con P/C Audio? Copy Emphasis Mode

It becomes obvious that the meaning of the following bits differs quite substantially between the two formats. If a device like a common DAT recorder only has an SPDIF input, it usually understands only this format. In most cases, it will switch off when being fed Professional-coded data. The table shows that a Professional-coded signal would lead to malfunctions for copy prohibition and emphasis, if being read as Consumer-coded data.

Nowadays many devices with SPDIF input can handle Professional subcode. Devices with AES3 input almost always accept Consumer SPDIF (passive cable adapter necessary).

Page 75

31. Block Diagram HDSP 9652

RME Audio Hammerfall HDSP 9652 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual