Junger Audio C8082 User Manual

C808

2

digital audio
modular
processing system

C8000

switch over & ducking

features

Automatic or manual Switch Over or Fail Over in case of input level loss. Ducking of a main stereo or
surround sound signal by a line level microphone or by a pre recorded announcement / ad input.

• 5.1 to stereo Fail Over / Switch Over

• 2x Stereo Fail Over / Switch Over

• 5.1 Ducking to C, L&R or L&C&R

• 2x Stereo ducking

• Detection of low input level and automatic Fail Over switching

• Detection of the ducking source signal and automatic Ducking

• Manual operation via GUI or GPI for Switch Over and Ducking

block diagram

The block diagram on the next page gives an overview of the signal flow within the C8082.
It receives the input signals via four C8k audio busses. The Main signals (Main Stereo #1 and #2) must
be applied to Ch1/2 and Ch 3/4 respectively, while the Aux channels for Ducking or fail over must be
applied to Ch 5/6 and Ch 7/8.

The C8082 has 6 mixing nodes which perform the switching or ducking functions. Honestly there is no
real switch mode because all switch processes are cross fades to prevent from switching noise.

The mixing nodes receive their parameters depending on the operating mode from the DSP controller
on the PCB. This DSP controller communicates via CAN bus with the C8k Frame Controller.
Therefore it needs a unique CAN address.

The Frame Controller itself runs a web server. This web server generates a web technology based
GUI. It may be displayed by IE8 or FireFox 3.6 or higher (see C8702 manual for details).

The inputs of the C8082 are equipped with level detectors for either detecting a loss of the input or an
active source for Ducking. The Fail / Duck detection part performs the logical action depending on the
various input statuses and user defined operating modes.

6 two channel outputs feed the processed signals back to the C8k frame bus. Each of these 6 outputs
has the Junger Brickwall limiter inserted. This limiter not only provides smooth non distortion output
in case of an overload but also defines the maximum output level. The algorithms are adaptive to the
material so only one parameter, the Limiter Program, is needed to set up this part. For 5.1 or stereo
processing the limiter control circuits are automatically linked together for proper multi channel
operation.

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C808

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digital audio
modular
processing system

switch over & ducking

C8082 block diagram

C8000

limiter

limiterlimiterlimiter

limiterlimiter

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C808

2

digital audio
modular
processing system

C8000

switch over & ducking

technical specifications

AUDIO :
resolution : 24bit
sample rate : 32...48kHz
digital processing delay : 2ms constantly

GENERAL :
backplane connector : ref. to DIN41612, 64pin, a+b, male
power supply : +5V DC
power consumption : approx. 1.000mA
dimension : 3RU, 4HP, 160mm depth
temperature : 10°C … 40°C
humidity : 90%, non condensing

hardware settings

The C8082 does not have front panel controls. It may be configured by switches and
via web browser.

On the front panel there is a status LED with different display modes:

green = status OK
yellow flashing = the module is under control of the Frame Controller
red = status is bad. It needs remote reading of the status via GUI.

It is likely that the Frame Controller has issued a SNMP trap.

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C808

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modular
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location of switches:

C8000

dip-switch settings

Since this type of module has an electronic output routing facility, great care must be taken when installing
or exchanging a module!

NO LABEL: ON
CAN address range is extended by +16 (counting from 0x10 to 0x1F)

OFF
CAN address range is standard (counting from 0x0 to 0xF) see rotary

encoder settings below.

REMOTE: must be ON
BUS-EN: ON

Connects the outputs to the C8k audio buses on power up automatically.

The output configuration will be taken from the NV (non volatile) memory.
OFF
Disconnects the module outputs from the C8k buses on power up.

Important note! To avoid audio bus conflicts when you replace a module or install an additional one and
the configuration is unknown, the output bus drivers must be disabled by BUS-EN=OFF before inserting it.
If all settings are done remotely and the unit fits into the bus assignment scheme of a frame, you must
remove it and place the switch back into position BUS-EN=ON.

TDM: must be OFF

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C808

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digital audio
modular
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C8000

switch over & ducking

rotary encoder settings

I/O not used
MODE not used

CAN 0 – F
The 16 switch positions are hexadecimal numbers (0x0 to 0xF) it sets the

CAN ID. Each module within a frame must be assigned a unique CAN bus

address for proper communication with other parties of the frame, e.g. the

frame controller or the GPI/O module.

Important note! This address also sets the position of the module graphic when you control the frame via
the web GUI by a C8702 frame controller. See C8k system manual for details.

remote control operation

- Web-server based remote control of parameters via frame controller C8702

- 3rd party remote control by http protocol based API

(please contact Junger Audio for details)

- Hardware GPI/O control of preset operation and special module functions

- Remote control by the brc8x Broadcast Remote Controller via CAN bus

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C808

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web browser based configuration

OVERVIEW

C8000

The above example shows a C8082 working with the C8403 HD-SDI Interface.
Clicking on the spanner tool within the module graphics of the C8082, will open the pages of that
module while the switching tool will open the Preset load function only.

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C808

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PRESETS

C8000

Audio the 8082 has 16 processing related Presets
Input Bus Routing for flexible signal routing you may change the input bus configuration by

Load will load one of the available presets from the modules NV memory
Save as # Name here you can select a Preset Number (memory location) and

assign the preset a 16 character name
Preset Clipboard you can copy the data of the active parameters to a clip board

and paste such data into the preset memory of another module

within one frame

Backup Presets to File store all presets of one C8082 into a file
Restore Presets from File restore all presets for a C8082 from a file

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one of the 8 Presets

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C808

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C8000

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There are 16 presets available for audio processing. The presets will store all the PARAMETERS as
you see it on the PARAMETERS pages in the different operating modes. The Presets will be programmed
with a set of factory default parameters if you initialize the module.

The factory default settings (PRE1 …. PRE8) for 2x Stereo Ducking are :

#

1 Gain 0.0dB
2 Ducking Gain -6.0dB
3 Fade In Time 10msec.
4 Fade Out Time 5sec.
5 Limiter Threshold 0.0BFS
6 Limiter Program uni
7 Ducking Mode Auto
8 Bit Transparent Off

9 Gain 0.0dB

10 Ducking Threshold -30.0dBFS.

There are another 8 presets (#17 - #24) available for Input Bus Routing.
They have the following default values :

IN 1/2 Bus S1
IN 3/4 Bus S2
IN 5/6 Bus S3
IN 7/8 Bus S4

Name (for both channels) Value

Main Stereo Source #1 and #2

Ducking Source #1 and #2

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C808

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digital audio
modular
processing system

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DEVICE settings

C8000

Device Name a 16 character device name can be set
Platform the hardware platform
Firmware

Controller firmware version of the built-in module controller
DSP (TI) firmware of the DSP engine
FPGA firmware of the FPGA
Restart Module warm starts the module (like a reset)
Initialize …. recalls factory default settings for parameters, presets, bus routing etc.
Backup will store all module data from its NV-memory to file
Restore will restore module data from file to its NV-memory

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C808

2

digital audio
modular
processing system

switch over & ducking

PARAMETERS for 2x Stereo Ducking mode

C8000

On the PARAMETER page you can set the parameters for the two stereo processing channels
independently. You will find a list of the parameters with a short description on page 15.
The content of the PARAMETERS page depends on the Operating mode of the C8082.

Bypass The ducking processor will be bypassed when the check box is active.
Gain The main channel gain setting to align the module to the level diagram of the

Ducking Gain The relative gain represents the amount of level reduction of the Main Stereo

In Fade Time The time the Main Stereo Channel needs to reduce its relative gain from 0dB

Hold Time The time the module stays in ducking mode after ducking source is below

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signal path.

channel if Ducking is active.

to the value of Ducking Gain.

Ducking Threshold again.

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C808

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digital audio
modular
processing system

C8000

switch over & ducking

Out Fade Time The time the Main Stereo Channel needs to increase its relative gain from

Ducking gain to 0dB.
Limiter Threshold The threshold of the peak limiter defines the maximum output level of the

respective stereo channel. Both stereo channels are linked together for

Limiter Program The dynamic parameters of the limiter are adaptive controlled by the DSP

Ducking Mode The ducking process may either be controlled automatically by the ducking

Proc Status Monitor The check box will turn on the monitoring of limiter activities. The Limiter

Gain A static gain that may be applied to the Ducking signal if the level does not fit

Ducking Threshold For automatic operation this threshold determines the level of the Ducking
A sophisticated Expander / Gate algorithm allows for fast but smooth fade in

proper operation.

process. No attack, decay or release time needs to be set up, only one

parameter called Limiter Program is required.

source or manually via above radio buttons or external GPI. If the setup via

GUI is Auto, an external GPI may set the Ducker to On to force ducking. If

another external GPI turns ducking Off later on, it will return to Auto mode. If

the previous setup was Off a GPI will turn ducking On and Off respectively.

The administrative setup via GUI will overwrite GPI trigger.

Status soft LEDs are grey if turned off and green for normal activity. Limiter

gain change over time is low pass filtered. If the outcome exceeds 3dB the

respective status LED turns red. This status information is condensed for all

processing channels by the module controller. The frame controller will

condense the status information for all processing modules within a frame

and may generate a SNMP trap and/or fire a GPO. In this case the SNMP

manager may poll the frame for details to “see” which processing channel

has “hyper active” limiters.

into the level diagram of the Main signal.

Source which will initiate the ducking process.

of the Ducking signal.

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11/19

C808

2

digital audio
modular
processing system

switch over & ducking

PARAMETERS for 5.1 Ducking mode

C8000

Ducking Channel Here you can decide into which of the 5.1 front channels the ducking source

will be mixed.
The other parameters above are the same as for the 2x stereo Ducking mode. Except for 5.1 only one

program may be processed at a time by a C8082. See SETUP page for I/O details.

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C808

2

digital audio
modular
processing system

switch over & ducking

PARAMETERS for 5.1 Fail Over mode

C8000

Gain The Main 5.1 channel has a gain setting to align the module to the level

Fail detection Ch You can select which of the surround channels L, R, L&R or L&R&C will be

Fail Threshold The selected input will be RMS weighted. The level which determines an

Fail Wait You can set up a wait delay before the switch over to the AUX channel takes

Fail Return You can set up a Return delay before the switch over back to Main Channel

Crossfade Time This parameter defines the speed of the switch over in both directions.

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diagram of the signal path.

observed by the level detector to decide if the 5.1 input has failed.

input failure must be set here.

place.

takes place if weighted input level is back above Threshold.

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C808

2

digital audio
modular
processing system

C8000

switch over & ducking

Limiter Threshold The threshold of the peak limiter defines the maximum output level of the

respective stereo channel. Both stereo channels are linked together for

Limiter Program The dynamic parameters of the limiter are adaptive controlled by the DSP

Switch Mode The switch over process may either be controlled automatically by the failure

Proc Status Monitor The check box will turn on the monitoring of limiter activities. The Limiter

Gain A static gain that may be applied to the Fail Over Source if the level does not

PARAMETERS for 2x Stereo Fail Over mode

The above parameters also apply for the 2x Stereo Ducking.

proper operation.

process. No attack, decay or release time needs to be set up, only one

parameter called Limiter Program is required.

of the Main Source or manually via above radio buttons or external GPI. If

the setup via GUI is Auto, an external GPI may set the Switch Over to On.

If another external GPI turns Switch Over to Off later on, it will return to

Auto mode. If the previous setup was Off a GPI will turn Switch Over to On

and Off respectively. The administrative setup via GUI will overwrite GPI

trigger.

Status soft LEDs are grey if turned off and green for normal activity. Limiter

gain change over time is low pass filtered. If the outcome exceeds 3dB the

respective status LED turns red. This status information is condensed for all

processing channels by the module controller. The frame controller will

condense the status information for all processing modules within a frame

and may generate a SNMP trap and/or fire a GPO. In this case the SNMP

manager may poll the frame for details to “see” which processing channel

has “hyper active” limiters.

fit into the level diagram of the Surround signal.

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C808

2

digital audio
modular
processing system

switch over & ducking

SETUP

C8000

The SETUP page defines the basic operating mode for the C8082 and tells the module the signal
format of the auxiliary channels for Ducking or Switch Over (Fail Over). The descriptions in Italic below
are for future enhancements of the C8082.

5.1 Fail Over If you feed the C8082 with a Main 5.1 you may exchange that signal by a

2channel signal if the 5.1 input gets lost. The module will permanently

monitor the 5.1 main channels in pre defined combinations to decide if the

input gets lost. In this case it may automatically switch over to the stereo

auxiliary input called Fail Over Source. Depending on the channel mode of

the Fail Over Source (LL, RR or stereo) it will be switched into the L and R

5.1 channels while the other 5.1 channel will be muted. See PARAMETERS

page: Switching Mode for details.

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C808

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digital audio
modular
processing system

C8000

switch over & ducking

2x Stereo Fail Over Two independent stereo channels will be monitored permanently to decide if

one of the inputs got lost. In this case the C8082 may automatically switch

over to the dedicated Fail Over Source depending on the channel mode of

5.1 Ducking A 5.1 signal may be mixed with a 2 channel ducking source. The process

2x Stereo Ducking Two independent stereo Main channels may be mixed with a dedicated

table of processing parameters (italic applies to Fail Over mode)

that source.

may be initiated by the level of the ducking source in automatic mode or

triggered manually by a GPI.

2 channel ducking source. The mixing depends on the channel mode of the

ducking source (LL, RR, stereo). The process may be initiated automatically

by the level of the ducking source or triggered manually by a GPI.

For details see PARAMETERS – 2X STEREO DUCKING.

#

1a Gain -20.0 … +20.0dB
1b Gain -20.0 … +20.0dB

2a Fail Detection Ch L or R or L&R
2b Fail Detection Ch L or R or C or L&R&C

3 Fail Threshold -60 …. -40dBFs
4 Fail Wait 0 …. 90 sec.
5 Fail Release 0 ….. 5 sec.

6 Fail Blend / Crossfade 15ms …. 5sec.
7 Limiter Threshold 0.0 … -20dBFS
8 Limiter Program live, speech. pop, uni, classic

9 Switch Mode Off, On, Auto(On,Off), Auto(On)

10 Ducking Gain -3 …. -20dB
11 In Fade Time 0 … 200 msec.
12 Hold Time 0 … 10sec.
13 Out Fade Time 0 … 10sec.
14 Ducking Mode Off, On, Auto
15 Ducking Channel C or L&R or C&L&R
16 Ducking Threshold -60 ….. -20dBFS

Name Range Steps Description

0.1 dB

0.1dB

1dB

0.5sec.

0.5sec.

0,5sec.
In 0.1 dBFS steps

1dB

0.5ms
500ms
500ms

1dBFS

For Main channels (5.1 and stereo)
For AUX channels (LL, RR or stereo)

Stereo mode

5.1 mode

Time from fail detection to switch over
Time from good detection to switch back

Reduction of Main signal in case of ducking

5.1 mode only
Ducking, source level threshold

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C808

2

digital audio
modular
processing system

C8000

switch over & ducking

BUS ROUTING

Keeping in mind that normally 2 audio signals are multiplexed for transportation over one of the c8k
frame bus lines, the C8082 offers the feature to multiplex 8 audio signals over one bus line.
This will increase the density of the modular c8k system :

from C8000 Bus
8Ch Mux Here you can select a bus line that carries 8 audio channels.
By use of the IN 1/2 – IN 7/8 check boxes you can decide if the signal
IN 1/2 for the relevant processing input is taken from the respective position
IN 3/4 within the 8 Ch Mux stream. The position is defined by the IN x/y
IN 5/6 number. I.e. the signal for input 1/2 will be taken from the audio
IN 7/8 channels 1 and 2 of the 8 channel Mux stream.

In the above example the 6 signals for the Surround Main input are

taken from the audio channels 1 – 6 of the 8 Ch Mux on Bus # 31,
while the stereo ducking signal is taken from Bus # 32.

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C808

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digital audio
modular
processing system

C8000

switch over & ducking

Error Detection An upstream module may insert a flag into each channel of the serial

audio data stream. If this flag is not detected, the Bus Status display
will turn red. If an upstream module does not insert such a flag you
must turn Error Detection Off in order to prevent non valid error

to C8000 Bus
8Ch Mux Here you select a bus that will carry the outputs of the processor in the

Ch 1/2 because the C8082 has only 6 outputs in 5.1 ducking mode while it
Ch 3/4 has only 4 outputs in 2x Stereo Ducking mode.
Ch 5/6 In parallel you may also assign a 2 Ch bus to one or all of the

Enable C8k Bus Driver You may turn off all bus drivers (put them into tri state mode) for
See also BUS-EN switch (page 4)

conditions.

order of Ch 1 – Ch 6. The positions for Ch 7 and Ch 8 are empty,

processor outputs

installation / testing to prevent conflicts with modules already in use.

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C808

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modular
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C8000

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GPI/O

On the GPI/O page you can assign GPIs numbers to activate Presets or turn special operating modes
on and off and you can assign GPOs numbers to reflect the operating status of the C8082 via parallel
GPO interface :

If the C8082 reads one of the GPI numbers on the CAN bus (you have assigned above), it will load
the respective Preset or turn the respective processing mode on.

If a GPO is asssigned, the C8082 will generate this number on the CAN bus for the C8817 parallel

GPI/O module or the brc8x broadcast remote controller.
Important Note! It is not possible that a module may issue a GPO that will be interpreted by another

module of the same frame as a GPI. If you need dependent actions triggered by modules of the same
frame you must use the GPI/O conversion feature of the C8817 module.

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19/19