General instructions
To reduce the risk of fire or electrical shock, do not expose this appliance to rain or moisture, direct
sunlight or excessive heat from sources such as radiators or spotlights. No user serviceable parts are inside. Repair and maintenance must be carried out by qualified personnel authorized by MUTEC GmbH!
The unit has been designed for operation in a standard domestic environment. Do NOT expose the unit
and its accessories to rain, moisture, direct sunlight or excessive heat produced by such heat sources as
radiators or spotlights! The free flow of air inside and around the unit must always be ensured.
CAUTION
RISK OF
ELECTRICAL SHOCK!
Initial operation
Prior to the init ial operation of the unit , the ap plianc e, its a ccessorie s and pac kaging m ust be
inspecte d for any si gns of ph ysical damag e that may h ave occurred du ring tra nsit . If the un it has
been da maged mechanicall y or if liquids have been spilled i nside t he encl osure , the app liance m ay
not be co nnec ted to the mains or m ust be disconnec ted fro m the mains imme diatel y! If the unit is
damag ed, please do N OT return it to MUTEC Gmb H, but no tify your deal er and th e shipp ing com pany immediat ely, oth erwise clai ms for damage or replac ement m ay not be granted .
If the device is left in a low-temperature environment for a long time and then is moved to a roomtemperature environment, condensation may occur on the inside and the exterior. To avoid shortcircuits and flashovers, be sure to wait one or two hours before putting the device into operation.
Power supply
The device contains a self-adapting wide-range power supply supporting the majority of global standard line voltages within a range of 90…250 V, with no need for making adjustments. Make sure that
your line-voltage source provides a supply voltage within the specified range. In addition, make sure
that the device is properly grounded via the local electric installation.
Pleas e use th e enclo sed po wer cord ( see packaging) to connect th e unit to th e mains . Switch the
unit of f before you at tempt t o connect it to the mains . Connect th e power cord to the u nit, then
to a standard 3 -pin mains outlet. To dra w the power cord , never p ull on the c able but on the mains
plug!
The uni t must b e grounded during operation!
For information on the power-inlet wiring, refer to the »Wirin g of connectors« section in the
appendix. Disconnect the device from the mains when not using it for an extended period!
Declaration of Conformity
We herewith confirm that the product complies with the European
Commission’s standards on electromagnetic compatibility.
Interference emission: EN 50081-1, 1992
Resistance to interference: EN 50082-1, 1992
Presupposed as operation condition is that all clock outputs are connected with high-quality and good shielded BNC 75 ohms cable.
This symbol, a flash of lightning inside a triangle, alerts
you to the presence of uninsulated dangerous voltage
inside the enclosure - voltage that may be sufficient to
constitute a risk of shock.
This symbol, an exclamation mark inside a triangle,
alerts you to important operating or safety instructions
in this manual.
WARRANTY REGULATIONS
§1 Warranty
MUTEC GmbH warrants the flawless performance of this product to the original buyer for a period of two (2) years from the date of purchase. If any failure occurs within
the specified warranty period that is caused by defects in material and/or workmanship, MUTEC GmbH shall either repair or replace the product free of charge within 90
days. The purchaser is not entitled to claim an inspection of the device free of charge during the warranty period. If the warranty claim proves to be justified, the product
will be returned freight prepaid by MUTEC GmbH within Germany. Outside Germany, the product will be returned with the additional international freight charges payable
by the customer. Warranty claims other than those indicated above are expressly excluded.
§2 Warranty transferability
This warranty is extended exclusively to the original buyer who bought the product from a MUTEC GmbH specialized dealer or distributor, and is not transferable to anyone
who may subsequently purchase this product. No other person (retail dealer, distributor, etc.) shall be entitled to give any warranty promise on behalf of MUTEC GmbH.
§3 Waranty regulations
The return of the completed registration card, or online registration on one of the websites specified below, is a condition of warranty. Failing to register the device before
returning it for repair will void the extended warranty.
The serial number on the returned device must match the one stated on the registration card or entered during online registration. Otherwise, the device will be
returned to the sender at the sender’s expense.
Any returned device must be accompanied by a detailed error description and a copy of the original sales receipt issued by a MUTEC dealer or distributor.
The device must be returned free of shipping expenses and in the original package, if possible; otherwise, the sender has to provide comparably protective packaging.
The sender is fully responsible for any damage or loss of the product when shipping it to MUTEC GmbH.
§4 Limitation of warrant y
Damages caused by the follow ing condition s are not covered b y this war ranty:
Damages caused by every kind of norm al wear an d tear (e.g. displays, L EDs, potentiometers , fader s, switche s, buttons, conn ecti ng elem ents , print ed labe ls, co ver
glasses, cover prints, and similar parts).
Functional failure of t he prod uct caused b y improper ins tallation (pleas e observe CM OS comp onent s handling ins truc tions!), negle ct or misuse of
the pro duct , e.g. fa ilure to o perate the unit i n compliance wi th the in stru ctions given in the us er or servic e manual s.
Damage caused by any form of ex ternal m echan ical im pact o r modif icati on.
Damage caused by the user’s f ailure to connect and operate t he unit in compli ance with loca l safet y regu lation s.
Damage caused by forc e majeur e (fire , explo sion, flood , lightning, war, vandalism, etc.).
Consequential damages or d efec ts in produc ts fro m other manufac turers as well as any costs re sulting from a loss of pr oduc tion.
Repair s carr ied out b y pers onnel w hich is n ot authorized f rom MUT EC GmbH w ill void the warranty. Adaptations and modifications to the device made with regard to
national, technical, or safety regulations in a country or of the customer do not constitute a warranty claim and should be set with MUTEC GmbH in advance.
§5 Repairs
To obtain warranty service, the buyer must call or write to MUTEC GmbH before returning the unit. All inquiries must be accompanied by a description of the problem and
the original buyer’s invoice. Devices shipped to MUTEC GmbH for repair without prior notice will be returned to the sender at the sender’s expense. In case of a functional
failure please contact:
MUTEC Gesellschaft fuer Systementwicklung und Komponentenvertrieb mbH
Siekeweg 6/8 • 123 09 Berlin • Germany • Fo n 030 -7468 80- 0 • Fax 030-746 880-9 9 • Tecsupp ort @MUTEC-net.com • www.MUTEC-net.com
Thank you very much for purchasing the MC-3+ Smart Clock, Synchronizable
Digital Audio Master Clock Generator, from MUTEC !
General Description
The new MUTEC MC-3+ Smart Clock is especially designed to improve the
acoustical quality of digital audio devices in two ways: At first by clocking
external devices with ultra-low jitter Word Clock signals and secondly by
aggressively re-clocking incoming digital audio signals. Therefore, we have
developed a totally new clocking technology, which we are calling the
»MUTEC 1G-Clock«. That means in practice, we are running – for the first
time in the audio industry – an audio clock synthesis process with a basis
clock rate in the gigahertz area! Together with new ultra-low-noise power
supplies and new PCB design rules aligned to high-speed communication
technologies, the MUTEC 1G-Clock brings jitter and electrical noise down
to unique low levels, which leads to unprecedented transparency in your
audio recordings.
Also working as a clock distributor and unlike other products, the MC-3+
effectively regenerates incoming clock signals to higher purity as the signal
source. Thus, the MC-3+ enables to improve already existing clock systems
and helps to raise the standard of sound reproduction in every studio
environment.
Additionally, the MC-3+ Smart Clock locks to so-called atomic clocks or
GPS receivers to raise its timing accuracy to the highest possible level. For
use during live events or in mobile trucks, the MC-3+ features an anytime
fail-safe clock generation in every operation mode. Entering the hold-over
mode and re-synchronization of returning clock references is carried out so
smoothly that live recordings surely will not affected.
The new MUTEC MC-3+ Smart Clock and its unique 1G-Clock add with the
most aggressive jitter reduction a significant improvement in sound to any
studio set-up, while ensuring flawless synchronization of connected devices
at any time!
Features
Incorporates MUTEC’s unique 1G-Clock technology for lowest jitter
possible
Improves audiophile quality of any connected digital audio device
Re-clocks digital audio most aggressively
Offers unique asynchronous audio re-clocking
Raises clearly audible the sound quality of any DA converter
Eliminates digital “Clicks and Pops”
Enhances existing master clocks
Digitally-compensated clock accuracy for highest precision of the
generated clocks
Locks to 10MHz clock signals of so-called Atomic clocks or GPS
receivers
Outputs clock signals fail-safe in any state of operation
Generates Word Clocks, Super Clocks, AES3 + S/P-DIF blanks
simultaneously
Converts between AES3 and S/P-DIF as well as between AES11 and
Word Clock
New-designed, simple user interface
Front panel lock-out for preventing misuse
Rack-space-saving 9.5“ housing
Built-in, internationally useable power supply
be read carefully! These include additional
information which are of major importance
for the functional descriptions in the text
column.
Standard grey boxes contain supplementary
informationen for the corresponding
sections in the text columns. The content of
the individual box refers to the description
in the text column beside the box.
your MUTEC product through our website
immediately after purchasing. This ensures
full warranty services over a period of two
years after purchasing the product. Moreover, for all registered products we offer to
our customers technical support. We also
will inform you about product updates and
new products which may of interest for you
(on voluntary base, of course).
Please regsiter your product at:
www.MUTEC-net.com
> Service > Product Registration
Information Boxes
Boxes which contain a triangle with
an exclamation mark inside should
Register your MUTEC Product
for Warranty and Support!
Audiophile sound improvement of digital audio devices
Elimination of »clicks and pops« in audio recordings
Enhancing and stabilization of existing clock chains
Stellate, ultra-low-jitter clock signal supply
Addition of redundancy to clock chains in use
Increase of clock signal reliability during live events
Multiple clock rate synchronization
Peripheral MUTEC Products
Signal Distribution Amplifiers:
MC-2
The MC-2 is a high-performance digital audio and reference sync signal
distribution amplifier for AES3/11 and AES3/11id signals. The unit distributes and converts between the mentioned AES signals and interface
standards.
MC-7
The MC-7 is a flexible, high-performance 8-channel Word Clock distribution amplifier and audio clock converter.
Format and Sampling Rate Converters with internal Master Clock:
MC-4
The MC-4 is a high-performance digital audio multichannel format and
sampling rate converter for ADAT
MC-6
The MC-6 is a high-performance digital audio dual channel format converter for AES3, AES3id and S/P-DIF.
MC-8 + MC-8.1
The MC-8 and MC-8.1 are 8 channel, high-performance digital audio
and sampling rate converters for AES3 and AES3id.
TM
, AES3 and S/P-DIF
Accessories:
Optical cables in different lenghts from 0.5 m to 20 m for S/P-DIF and
TM
transfers.
ADAT
MW-05/19
Set of two rack mounting angles to install one MC product frontally
into one unit of a 19” rack.
MW-03/19
Set of two rack mounting angles to install one MC product on the rear
side of a 19” rack.
MW-02/19
Mounting plate to install two MC products side by side into one unit of
a 19” rack.
For all peripheral products please have a look on our website:
www.MUTEC-NET.com
This red LED lights up when the unit is switched on with the rear panel
POWER switch.
2 »MENU«
Use this key to access the different functional menus.
3 »SELECT«
Use this key to select a function within a specific functional menu.
4 »MODE«
This function menu allows to select the clock references for internal and
external synchronization as well as the reference for asynchronous digital
audio re-clocking. All three LED rows act in functional dependence.
5 »REFERENCE
This function menu allows to select the clock references for internal or
external synchronization and the reference for synchronous and asynchro-
nous digital audio re-clocking.
6 »CLOCK
This function menu lets you determine the factor by which the basis clock
rate is multiplied additionally. Settings can be made individually for every
pair of Word Clock outputs (»1-3«) as well as for the AES3 (»5«) and S/P-DIF
(»4«) outputs.
7 »STATUS«
This menu indicates various signal status of the incoming reference clock or
digital audio signal.
8 »CLOCK
This menu indicates the clock rates of the incoming reference clock or
digital audio signal.
MULTIPLIERS«
IN«
32
4
INTERNAL + 10.0M«
5
6
8
7
Refer to the OPERATIONS chapter for more
information.
MC-3+ Smart Clock Rear Panel
4
1 »WC LK OUT 1 – 3«
These 3 pairs of Word Clock outputs transfer all standard Word Clock rates
and Word Clock x 256 for older digidesign ProTools™ systems. Their numbering is aligned to the corresponding functional menus on the front panel. The
individual BNC connectors are pairwise marked as »A« and »B«, which allows
for, e.g. simple documentation of the connected devices. The impedances of all
connectors are 75 Ω (BNC connectors, female).
For detailed specifications of all terminals,
please refer to the »Pin Assignment of the
Connectors« and »Technical Data« sections
in the APPENDIX chapter.
For a full list of all Word Clock, AES3 and
S/P-DIF clock rates that can be generated,
please refer to the »Generatable Word Clock
Frequencies« and »Generatable AES3 and
S/P-DIF Frequencies« sections in the APPENDIX chapter.
These two S/P-DIF outputs, available as optical and coaxial interfaces, transmit
an optical (»OP«) and unbalanced electrical (»CO«) S/P-DIF digital audio or
blank frame signal in compliance with the IEC 60958 standard. The coaxial
interface impedance is 75 Ω. (RCA connector), the optical interface offers a
Toshiba ToslinkTM connector, EIAJ standard.
3 »AES3/11 OUT 5«
This AES/EBU output transmits a transformer-balanced electrical digital
audio or blank-frame clock signal in compliance with AES3 –1992 (R1997) or
AES11–1997/2003. Its numbering is aligned to the corresponding functional
menu on the front panel. The output impedance is 110 Ω (XLR connector,
male).
4 »AES3/11 IN«
This AES/EBU input can receive a balanced digital AES3 or AES11 signal in
compliance with AES3 –1992 (R1997) or AES11–1997/2003. The input impedance is 110 Ω (XLR connector, female).
5 »S/P-DIF IN«
These two S/P-DIF inputs, available with optical (»OP«) and coaxial (»CO«)
interfaces, can receive an optical and an unbalanced electrical S/P-DIF digital
audio or blank frame signal in compliance with the IEC 60958 standard. The
coaxial interface impedance is 75 Ω. (RCA connector), the optical interface
offers a Toshiba Toslink
6 »WCLK + 10.0M IN«
This input can receive a Word Clock, a Word Clock x 256 as well as a
10.0MHz reference clock signal. The impedance of the connector is 75 Ω
(BNC connector, female).
7 »MAINS IN«, Power Switch + Mains connector (IEC)
This is the main switch for switching the device on and off. Connect the
supplied IEC power cable to the device‘s mains connector. Make sure that
the power switch is turned off before connecting the device to your power
source finally. Line voltages within the range of 90…260 V with a frequency
of 50 or 60 Hz can be applied. The internal power supply will automatically
make all necessary adjustments.
Read the SAFETY INSTRUCTIONS at the beginning of this manual!
The unit was packed carefully. Nevertheless we recommend to check the
content directly after opening the package:
1 x MC-3+ Smart Clock
1 x Power cable
1 x Manual
Placing the Device
The unit should be set up as closely as possible to the devices to which it
will be connected with to avoid excessive cable lengths. The four custom-designed case feets include a rubber ring to protect the ground’s
surface from being damaged.
The device can be mounted into a standard 19“ rack and will require one
unit. Therefore, we offer an optional rack mounting kit, called MW-05/19.
This includes two rack angles which need to be screwed at each side of the
device‘s case. Before mounting the device into a 19“ rack, please unscrew
the four rubber feets with a suitable screwer. Install the device so that one
unit of rack space is left free both above and below the device to allow
for sufficient ventilation! Additional slide-in rails on the rack inside are
recommended for safe installation. This will also avoid long-term mechanical
deformation of the housing.
The condition of the packaging material
and the device should be checked carefully
additionally. If there are any damages
please refer to SAFETY INSTRUCTIONS and
WARRANTY REGULATIONS.
Before installing the unit the section
SAFETY INSTRUCTIONS located
at the beginning of this manual
should be read carefully.
Never expose the device and
accessories to rain, moisture, direct
sunlight, or excessive heat produced
by radiators, heaters, or spot lights!
Sufficient air circulation in the environment
of the device must be ensured!
Wiring the AES/EBU and S/P-DIF Interfaces
AES/EBU
Connect the AES/EBU interfaces with the help of balanced electrical
cables equipped with XLR connectors on both ends. The specifications
stipulate a specific cable impedance of 110Ω (ask your retailer for a confirmation of this value when purchasing the cables).
S/P-DIF
Connect the coaxial S/ P-DIF interfaces with help of unbalanced electrical
cables equipped with RCA connectors on both ends. The specifications stipulate a specific cable impedance of 75 Ω. Ask your retailer for a confirma-
tion of this value when purchasing the cables.
Connect the optical S/P-DIF interface with the help of Toshiba TOSLINK™
compliant optical fiber cables. Here, you can use both plastic and glass
fiber-based cables. When using plastic fiber cables, lengths of 10 meters
should not be exceeded, so as to ensure the reliable transmission of signals.
Glass fiber cables can transfer data reliably even over greater distances.
Wiring the Word Clock Interfaces
To allow for the synchronization of signals, the interfaces of all devices
involved must be properly connected to each other, so as to ensure a
logical signal flow. Always be sure to connect the Word Clock output(s) to
the corresponding input(s) of the device(s) you wish to synchronize. Cable
lengths should be kept as short as possible to minimize signal losses and/or
interferences!
For the transmission of Word Clock signals, unsymmetrical cables with a
impedance of 75 Ω and BNC connectors on both ends are used. Typically,
such cables are marked with »RG-59U, RG59B/U«.
Additionally, make sure that the Word Clock input(s) has/have got a 75 Ω
terminating resistor! Most Word Clock inputs allow for enabling/disabling
the termination with a so-called »termination-switch«, which may be
located on the outside or inside of the device.
For devices which have no termination of the Word Clock input, e.g. RME
Hammerfall with Word Clock i/o, Alesis BRC or M-Audio ProFire Light
MUTEC offers optical cables of various
lengths that have been specifically tested
for the transmission of ADAT™ and S/P-DIF
signals. Ask your local dealer for such cables!
Cables for High Sampling
Rates
When working with high sampling
rates for AES3/-11 or S/P-DIF, well shielded
electrical cables are imperative to avoid
increased radiation! Standard cables are
normally useable for sampling rates up to
50.0kHz. Special shielded cables should be
used for transfer of higher sampling rates.
Cables for Word Clock
If a cable with a different imped-
ance than 75 Ω is used, a dramatic
deterioration of the signal quality is the
result! In this case, the sound quality and
synchronization of all devices involved can
be impaired.
It is imperative that the lengths of all cables
connected are largely the same, as this is
the only way to ensure that all devices will
be synchronized in phase (exception: cable
tolerances).
We recommend using high-grade cables with
a good shielding. A length of max. 10 meters
(approx. 30 feets) should not be exceeded!
bridge, you can use an additional BNC-T piece to terminate the input. Plug
the T piece with its center connector into the input of the receiving device.
Then, connect the cable coming from the Word Clock output to one of the
lateral connectors, and the other connector of the BNC-T piece to a 75 Ω
resistor forming the BNC termination.
Basically, you should avoid »looping through« Word Clock leads by means
of passive BNC-T pieces to preserve the signal quality, as level drops will be
the result. If there is no other way to wire your set-up, please make sure
that all Word Clock inputs (except for the last device in the chain) have
their terminations disabled! In a serial Word Clock chain only the last clock
input should have a termination! Never connect more than three devices in
series to one output!
Operating the MC-3+ SMART CLOCK is very easy! The device is fully
operated using the two keys at the front panel.
1 Pressing the »MENU« key toggles between different basic function
menus.
2 Pressing the »SELECT« key activates individual functions within one
function menu.
2. SELECT
selects individual
1. MENU
function menus.
MENU + SELECT operation
selects individual
functions within
one function
menu.
and INSTALLATION chapters before first
powering-up!
We also recommend reading the CONTROL
ELEMENTS AND TERMINALS chapter for
information on how to connect MC-3+ !
Safety Instructions
For safety reasons, be sure to
read the SAFETY INSTRUCTIONS
Functions
Function Menus + Functions
Steps of Operation
1 The first press on »MENU« or »SELECT« key enables the last selected
function within the last selected function menu. The corresponding LED
starts flashing.
2 Every press on »SELECT« button will select a new function within a menu.
The LED of the selected function flashes accordingly. After the LED stops
flashing, the function is activated.
3 When the needed function is selected, do not press the switches again!
After a period of approx. 4 seconds the LED of the selected function stops
flashing.
The »STATUS« area is not accessible by using the »MENU« and »SELECT«
keys, it only shows different operating conditions of the device.
These three main function menus offer access to the whole functionality of
Shut-Down of Outputs
All digital audio outputs are shut-
down during function selection!
After a function is finally selected and the
corresponding LED lights constantly again,
the digital audio outputs are activated for
signal transfer.
User Settings Remain
All user-specific function settings
are available furthermore when
power is restored.
your MC-3+ Smart Clock.
The »MODE« menu allows to select for the general operation mode of the
MC-3+. It has to be selected first. The factory default is set to »INTERNAL«.
The »REFERENCE« menu including the sub menu »INTERNAL + 10.0M«
allow to select all external acceptable references, the references for
synchronous and asynchronous audio re-clocking as well as the internal
clock generator. The factory default is set to »INTERNAL« with 44.1kHz.
Within the »CLOCK
individually for each pair of Word Clock and the digital audio outputs.
Their numberings are assigned to the output numbers on the rear. Select
the prefered output with the »MENU« key and the needed multiply factor
by pressing the »SELECT« key accordingly. The factory default is set to x 1.
The menus »STATUS« and »CLOCK
operation status only. They are not accessable for adjustments.
MULTIPLIERS« menu you can select additional multipliers,
IN« are for control of the MC-3+‘s
General Operation Procedure
The menu of your MC-3+ is strictly organized aligned to general handling
procedures when inserting the MC-3+ into your studio set-up. Thus, you can
split up all of the necessary adjustments in three steps only, which leads to
the following three questions for the basic operation of your MC-3+:
1) Which operation mode is basically needed? → MODE
Should my MC-3+ work as clock generator (»INTERNAL«), as clock
distributor (»EXTERNAL«) or as audio signal re-clocker (»RE-CLOCK«)?
INTERNAL
EXTERNAL
RE-CLOCK
MODE
2) Which reference do I need for my clocking application? → REFERENCE
WCLK
10.0M
S/P-DIF op
AES3/11
S/P-DIF co
REFERENCE
3) Do I need different clock rates at the same time? → CLOCK MULTIPLIERS
15432
x 1
x 2
x 4
x 256
CLOCK MULTIPLIERS
32.0
96.0
44.1
176.4
48.0
192.0
88.2
INTERNAL + 10.0M
After these general decisions are made, your MC-3+ is configured for
optimal operation in your set-up. Due to the fact that the system monitors
for useful function combinations, maloperation is not possible.
So, let‘s have a look to the individual functions on the next pages.
When running the MC-3+ in the
»Re-CLOCK« mode and applying a digital
audio signal of the AES3 or S/P-DIF format
as reference, all digital audio outputs will
transmit the sourse signal. The signals at
the outputs which are not of same format
as the reference signal will be format
converted in realtime aligned to the
AES3 – 1992/2003 and IEC 60958 digital audio
format standards. Thus, your MC-3+ Smart
Clock works also as digital audio format
converter for you!
INTERNAL
EXTERNAL
RE-CLOCK
MODE
This setting example shows the MC-3+ locked to its internal ultra-low-jitter
clock base generating output clocks of 44.1kHz at any available output. This
is the factory default setting.
There are three basic operation modes of your MC-3+ Smart Clock:
»INTERNAL«
The MC-3+ runs as a clock generator and is locked to its internal ultra-low-jitter master clock. The basis clock rate for all outputs is selected in
the »REFERENCE« menu under »INTERNAL + 10.0M« (see next page).
»EXTERNAL«
The MC-3+ is locked to an externally applied reference signal, which can
be a Word Clock, a 10.0MHz reference from a so-called atomic clock or
GPS receiver and an AES3/11 or S/P-DIF digital audio signal, selected in the
»REFERENCE« menu.
»RE-CLOCK«
The MC-3+ allows to receive digital audio signals of the AES3 or S/P-DIF
format (selected in the »REFERENCE« menu) especially for re-clocking to
improve their acoustical quality.
With selection of the »RE-CLOCK« mode, the first available digital audio
input »S/P-DIF op« is selected under »REFERENCE« automatically as default.
Press the »MENU« key for once and you enter the »REFERENCE« menu.
Here press repeatedly the »SELECT« key to select the desired digital audio
input.
You have three re-clocking options per selected audio input which support
two different types of audio re-clocking:
Synchronous Re-Clocking of Digital Audio Signals
Selecting one of the three available digital audio inputs only, re-clocks the
incoming audio signal with a phase-synchroniszed, new generated ultra
low-jitter clock signal, embedded in the outgoing audio signal at the
incoming audio signal‘s sampling rate.
Asynchronous Re-Clocking of Digital Audio Signals
This is a very special function only available in the MC-3+ Smart Clock!
When selecting one of the digital audio inputs, you will notice that for each
input you have two additional options when pressing the »SELECT« key
furthermore:
Selecting one of these re-clocking options enables you to re-clock your
digital audio signal with an additional clock reference of a different master
clock device. E.g., when selecting your desired audio input + »WCLK«, you
must feed in at the Word Clock input an addiitional Word Clock reference
signal with a clock rate between 32.0kHz and 192.0kHz. When selecting
your desired audio input + »10.0M«, the Word Clock input accepts a
10.0MHz reference signal from e.g. a so-called Atomic Clock or GPS receiver.
In both ways, the outgoing digital audio and Word Clock signals have got
the same basis clock rate like the incoming digital audio signal, but phase-aligned (not phase-synchronized, of course!) to the additionally applied
external reference clock.
In the »CLOCK
is displayed and with help of the »CLOCK MULTIPLIERS« menu the Word Clock
output signals can be multiplied as described in the »Selecting Clock Multipliers« section.
WCLK
10.0M
S/P-DIF op
AES3/11
S/P-DIF co
REFERENCE
IN» menu the clock rate of the incoming digital audio signal
Running the MC-3+ in the
»EXTERNAL« mode and applying a digital
audio signal of the AES3 or S/P-DIF format
as reference causes a conversion of the
audio signal into a blank frame signal
available at the digital audio outputs. Only
when running the MC-3+ in the »RE-CLOCK«
mode, the audio outputs will transmit the
incoming audio signal in its original format,
but re-clocked, of course.
In both operation modes, the Word Clock
outputs transmit phase-aligned and dejittered clock signals.
INTERNAL
EXTERNAL
RE-CLOCK
MODE
Selection of references is mainly used when the MC-3+ is set under »MODE«
to »EXTERNAL« or »RE-CLOCK«
The above setting example shows the MC-3+ locked to an external Word
Clock signal. Its clock rate is then displayed in the »CLOCK
right hand side of the front panel. Within the »REFERENCE« menu you can
select the other available inputs by presssing the »SELECT« key repeatedly.
The example shows furthermore, that in the »CLOCK MULTIPLIERS« menu mul-
tiplication factors are set for the indivdual outputs as follows:
Word Clock output pair 1: Reference clock x 1
Word Clock output pair 2: Reference clock x 4
Word Clock output pair 3: Reference clock x 2
S/P-DIF output 4: Reference clock x 2
AES3/11 output 5: Reference clock x 1
When working in the »INTERNAL« mode, only the LED bar marked with
»INTERNAL + 10.0M« is available for selecting the basis clock rate of all outputs. There are seven different basis clocks adjustable by pressing the »SELECT« key repeatedly. The LEDs display the selected clock rate as follows:
WCLK
10.0M
S/P-DIF op
AES3/11
S/P-DIF co
REFERENCE
32.0
44.1
48.0
88.2
INTERNAL + 10.0M
Supported Clock Rates for »INTERNAL + 10.0M«
32.0kHz44.1kHz48.0kHz88.2kHz96.0kHz
176.4kHz192.0kHz
Selecting 10.0M as Clock Reference
When stepping through the »REFERENCE« menu and selecting »10.0M«
as reference, simultaneously the first LED of the »INTERNAL + 10.0M« sub
menu starts lighting and you can select with the »SELECT« key one of the
seven clock rates provided by the internal ultra-low-jitter clock generator.
The outgoing clock signals are now of the selected clock rate, but phase-aligned to the externally applied 10.0MHz reference signal. Also in that
mode, clock multipliers can be adjusted freely, as mentioned in the »Selecting Clock Multipliers« section.
A 10.0MHz clock signal is applied as reference and the basis clock of all outputs is set to 48.0kHz.
The outputs provide different multiples of the basis clock rate due to the adjustments of the clock
multipliers. All four red LEDs in the »CLOCK
INTERNAL
EXTERNAL
RE-CLOCK
MODE
A coaxial S/P-DIF digital audio signal is applied as reference. All outputs provide their clock rates
aligned to the selected multiplication factors. The S/P-DIF (»4«) and AES3/11 (»5«) outputs supply
blank frame signals.
WCLK
10.0M
S/P-DIF op
AES3/11
S/P-DIF co
REFERENCE
WCLK
10.0M
S/P-DIF op
AES3/11
S/P-DIF co
REFERENCE
32.0
44.1
48.0
88.2
INTERNAL + 10.0M
32.0
44.1
48.0
88.2
INTERNAL + 10.0M
x 1
96.0
x 2
176.4
x 4
192.0
x 256
CLOCK MULTIPLIERS
IN« area light to show that a 10.0MHz reference comes in.
15432
x 1
96.0
x 2
176.4
x 4
192.0
x 256
CLOCK MULTIPLIERS
15432
96.0
176.4
192.0
96.0
176.4
192.0
x 1
x 2
x 4
x 256
CLOCK MULTIPLIERS
15432
x 1
x 2
x 4
x 256
CLOCK MULTIPLIERS
INTERNAL
EXTERNAL
RE-CLOCK
MODE
An optical S/P-DIF digitalaudio signal is synchronous re-clocked. All outputs provide their signals on
the same clock rate like this one of the incoming optical S/P-DIF digital audio signal.
INTERNAL
EXTERNAL
RE-CLOCK
MODE
An AES3 signal is asynchronous re-clocked with an additional Word Clock signal. All outputs provide
their signals with same clock rate like this one of the incoming AES3 digital audio signal, except the
Word Clock output 3 is set to output the double clock rate of the reference signal.
WCLK
10.0M
S/P-DIF op
AES3/11
S/P-DIF co
REFERENCE
WCLK
10.0M
S/P-DIF op
AES3/11
S/P-DIF co
REFERENCE
32.0
44.1
48.0
88.2
INTERNAL + 10.0M
32.0
44.1
48.0
88.2
INTERNAL + 10.0M
Selecting Clock Multipliers
Pressing the »MENU« key changes from the »REFERENCE» to the »CLOCK
MULTIPLIERS« menu. Here you can select for every pair of Word Clock and the
digital audio outputs individual clock rate multiplication factors of x1, x2,
x4 and x256 by pressing the »SELECT« key repeatedly. The multiplication
factors refer always to the basis clock rate of the incoming reference signal
or the clock rate selected of the internal ultra-low-jitter clock generator
(»INTERNAL + 10.0M«). Thus, dependently of the incoming or selected basis
clock rate, the MC-3+ covers a range auf audio related clock rates from
32.0kHz up to 768.0kHz plus the two so-called Super Clocks (see below).
The setting »x 256«, or so-called Super Clock, is only available for the three
pairs of Word Clock outputs. It transmits either a clock rate of 11,289.6MHz
(44.1kHz x 256) or 12,288.0MHz (48.0kHz x 256). The system analysis in any
way the basis clock rate of the incoming or the generated reference clock
signal, 44.1kHz or 48.0kHz, and outputs the corresponding Word Clock
x 256 for use with older digidesign ProTools
The multiplication of the digital audio outputs S/P-DIF (»4«) and AES3/11
(»5«) is limited to a maximum clock rate of 192.0kHz, regardless of the clock
rate of the reference signal.
TM
systems.
Multiplying Digital Audio
Signals
When having a digital audio input
selected as reference and setting the multiplication factor to higher than »x 1«, the
MC-3+ outputs a blank frame signal only at
the audio outputs. A sampling rate conversion of the incoming digital audio signal is
not carried out.
»STATUS« Area
This area displays different system conditions of your MC-3+. There is no
access for changing settings.
»LOCK«
This blue LED lights when the internal PLL circuit has detected the incoming
clock reference signal as valid. If the reference signal is unstable or lost, the
»LOCK« LED does not light.
»HOLD«
This red LED lights when the external reference clock signal is interrupted
or lost. The frequency synthesizer of the MC-3+ keeps generating all output
signals continuously, based on the last incoming clock rate. Thus, your
studio set-up receives non-interrupted clock supply, regardless if a valid
external referecne signal is present, unstable or lost. Re-synchronization is
carried out without affecting any of the outputs signals critically.
»AUDIO«
This red LED lights when a valid AES3/11 or S/P-DIF optical or coaxial digital
audio reference signal is detected at the corresponding input.
»CLOCK
This area displays the clock rate of the incoming clock or digital audio
reference signal. The following basis reference clock rates are supported
and will be analyzed:
Generic Functions
There are two additional functions which influence the working of your
whole MC-3+ Smart Clock:
Front Panel lock out + LED shut down
When pressing both front panel keys together at one time, all LEDs will
shut down except the »POWER« and »LOCK« LEDs. Additionally, the
functions of both keys are also blocked to prevent unauthorized operation,
which is important during e.g. live events.
To reactivate the keys and the LEDs, please press both keys for apperox.
four seconds until all LEDs light again.
IN« Area
Supported Input Clock Rates
32.0kHz44.1kHz48.0kHz88.2kHz96.0kHz
176.4kHz192.0kHz
12,288.0MHz11,289.6MHz10.0MHz
Factory Reset
You can reset the operating system of your MC-3+ Smart Clock to the
initial status by switching on the unit while pressing the »MENU« key
simultaneously.
Switching-off the Termination of the Word Clock Input
CAUTION! Disconnect the unit from the mains before opening!
Remount the aluminium cover thoroughly before you attempt to operate
the unit!
Word Clock
Input
S/P-DIF
Inputs
When the MC-3+ Smart Clock is shipped, the BNC-based Word Clock input
connector is terminated internally with 75 Ω. Therefore, one jumper is put
on two pins - Position 2 - of the 3-pin socket JP1.
Jumper:
JP2
Termination
3-pin socket
JP1
Word Clock Termination
MC-3+
Mainboard
PCB
12
Free Pin:
Jumper Position 2
= Termination
When moving the jumper from position 2 to position 1, the input termination will be switched-off. Therefore, the MC-3+ must be connected in a
chain, in which a device with terminated input follows. Otherwise you need
to use a BNC-T piece in combination with a 75 Ω BNC resistor for terminat-
ing the MC-3+’s input.
JP2
12
Jumper Position 1
= no Terminaltion
For additional information regarding this issue, please refer to page 11
under »Wiring the Word Clock Interfaces«.
Technical Data
WORD CLOCK + 10.0M INPUT
Interface1 x BNC, 200 mV-7 V, unbalanced, input impedance 75 Ω (can be switched off, see above)
Lock Range25.0kHz to 200.0 kHz, 10.0MHz, 11.2896MHz + 12.288MHz (so-called Super Clocks)
AES3 AUDIO INPUT
Interface 1 x XLR female, transformer balanced, input impedance 110 Ω , 200 mV – 7.0 V
Cover Size / Material / Color196 x 42 x 156mm without connectors (W x H x D), aluminium sheet 1mm, black
Front Panel Size / Material198 x 44 x 2mm (W x H x D), aluminium
Weight~ 1260g
AES3 + AES11 + S/P-DIF (optical + coaxial) conversion in every combination and direction
Word Clock + AES11 conversion in every combination and direction