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junger C8612, User Manual

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junger C8612 User Manual Download Page 17

 

 

digital audio 
modular 
processing system

 

C8000

 

Dolby Digital / Digtal plus / Pulse (AAC) encoder

 

C8612

 

17/20

 

 

Below a sketch to illustrate the respective parameters of the ducker in relation to main program and 
the voice over feed before it will be mixed : 

 
Warble Tone 

Warble Tone is a legacy technology developed by the BBC to help 
production, storage and transmission of AD (audio descriptive) 
content. It is a control signal that has the information about voice 
channel mono panning and main program (external program) 
fading. It is  digitally encoded and placed on one track of a two 
track signal. The other track contains the voice over signal. This 
makes it easy to store such AD content on the other two tracks of a 
4 track VTR or move it as a 2 track signal in parallel to the main 
stereo to the transmission site. At the transmission site in the past 
an extra so called Broadcast Mix was done and a second audio 
program (e.g. in dual language transmission format) was created. 
This enables the viewer of a movie or a TV show to select either 
the main program or the Audio Description program. In the old days 
of analog stereo transmission the left channel carried the main 
program converted to mono and the right channel the AD mono 
mix. When digital TV showed up and provided 4 audio tracks for 
transmission, both programs have been transmitted in stereo. 

 

Everybody will understand that this eats up a lot of precious 
bandwidth … Today we are able to do the receiver mix and it needs 
much less bandwidth to transmit just the voice over channel and a 
few control parameter which can be encoded in parallel to the main 
program to save more bandwidth. In a single PID transmission 
format it allows to use the technology of transmitting MPEG 
encoded stereo audio in parallel to Dolby Digital plus encoded 
stereo and audio descriptive channel. In this case the existing 
Warble Tone content can still be used. The C8612 simply decodes 
the Warble track and translates this into mixing meta data. 

 

Warble Tone 

[Off, On] 

Control Mode 

This turns the Warble Tone operation on. You must provide Warble 
Ton signal to input 7/8 of the C8612 (see functional graphic). 

 

Warble Tone 

[last used, internal, auto] 

Reversion Mode 

If there is a lost of Warble Ton you can decide what to do. 

External

Program

Scale

Factor

voice over signal

Trigger Level

Trigger Delay

Duck Attack

Trigger Hold

Duck Release

main (external) program signal

Summary of Contents for C8612

Page 1: ... bus as well as alternately on BNC monitor output Remote control web interface via C8702 frame controller block diagram C8612 Carrier Board 9 pin RDD6 Metadata SYNC System sync Inertface Module Controller Encoder 1 L R CAN BUS Interface BACK PLANE AUDIO INTERFACE 32 Bus Lines 2Ch or 8 Ch mux mode AUDIO ROUTER METADATA EXTRACTOR GPI O Handling Metadata Management Frame Controller Commmunication Pre...

Page 2: ...at Ambient 10ºC to 40ºC Humidity 90 non condensing Dolby metadata The Dolby Laboratories Inc have introduced the data about the audio data the Dolby metadata which are intended to travel along with the multi channel bit stream from acquisition point of audio recording to delivery Dolby Digital decoder at home either part of the TV Set Top Box or the home theater system Those metadata may control t...

Page 3: ...known bus configuration you must set BUS EN OFF before inserting the module into a C8000 frame Otherwise you are in risk to disturb other channels of the frame Pressing the INIT button during power up will initialize the module parameters to factory default values status LEDs FAIL flashing red hardware problem on the bottom right PCB edge STATUS green OK red bad flashing under GUI control DOLBY D ...

Page 4: ...ations parameters and functions via a web browser See also C8702 Frame Controller OVERVIEW The above example shows a C8612 Name AC3 Encoder in a typically processing chain Clicking on the spanner tool within the module graphics of the C8612 will open the pages of that module If you click on the switch tool you will get the page for changing Presets only ...

Page 5: ...5 Meta Preset 16 Reversion Preset will load one of the 16 available Presets from the NV memory of the module Select the preset of your choice and press LOAD NOW Encoders loaded Here you can see which encoder is affected by the actually from preset loaded preset Save as 1 16 Here you can select a Preset Number memory location Name You can give each preset a 16 character name The actual parameters w...

Page 6: ...ignal routing Load 33 Routing reset 1 40 Routing Preset 8 Will load one of the 8 available routing presets from the NV memory of the module Select the preset of your choice and press LOAD NOW Save as 33 40 Here you can select a Preset Number memory location Name You can give each preset a 16 character name The actual parameters will be stored if you press SAVE NOW Preset Clipboard You can copy the...

Page 7: ...roller Firmware version of the module controller Dolby Firmware Version Version of the Dolby CAT561 OEM module Restart Module Pressing RESTART will warm start the C8612 Initialize and Restore Pressing INITIALIZE will initialize the C8612 to factory Factory Defaults defaults and will warm start the module afterwards Backup Settings and Pressing BACKUP will download all settings including the Preset...

Page 8: ...mod 3 2L 1 0 L R DOLBY CAT561 OEM Board Firmware 2 4 0 3 and higher ENCODER CONFIGURATION two independent encoders Encoder 2 2 0 acmod 2 0 or 1 0 C LFE Ls Rs 2L 2R Metadata Multiplexer Consumer Metadata Metadata Multiplexer Consumer Metadata Program 1 Program 2 D D D D plus AAC HE AAC v1 v2 D D D D plus AAC HE AAC v1 v2 Encoder 1 5 1 acmod 3 2L 1 0 L R DOLBY CAT561 OEM Board Firmware 2 4 0 3 and h...

Page 9: ... stream may be transcoded directly to a D D plus stream The metadata may be modified for the output stream Encoder 1 5 1 acmod 3 2L 1 0 L R DOLBY CAT561 OEM Board Firmware 2 4 0 3 and higher ENCODER CONFIGURATION two associated encoders warbletone control single stream PID Encoder 2 2 0 acmod 2 0 or 1 0 Warbleton decoder C LFE Ls Rs Warbletone Program 1 Program 2 D D plus mixing enable Stream Mult...

Page 10: ...representation of the two encoders used by the C8612 module To C8000 System Bus S1 S32 OFF The two encoder outputs may be assigned to C8k busses as well as alternately to the external BNC monitor output Channel Status Professional Consumer The AES channel status for the encoded streams my be switched from Professional to Consumer format Enable Bus Driver You may turn off all bus drivers tri state ...

Page 11: ... For inputs connected to unused busses this detection should be turned off to prevent from unwanted SNMP traps Encoder Parameter Due to the different functions available for different encoding formats the accessible parameters may differ widely depending on the encoder mode Encoder Mode Dolby Digital Dolby Digital HE AAC v1 2 AAC Bitstream Packing Format ADTS MPEG 2 ADTS MPEG 4 LATM LOAS impl SBR ...

Page 12: ...kbps 3 2 224 kbps If both encoders are configured for 5 1 the graphic changes to represent the signal flow Data Rate kbps depending on the encoder mode Dolby Digital 32 AUTO 448 Dolby Digital plus 32 AUTO 256 Dolby pulse 28 HE AAC v2 AUTO the respective data rates for the various AUTO modes depend on the channel mode AKA acmod Dolby Digital data rates Dolby Digital AUTO data rates Dolby Digital mi...

Page 13: ...bps 128 kbps 896 kbps 144 kbps 960 kbps 160 kbps 1024 kbps 176 kbps 1088 kbps 192 kbps 1152 kbps 200 kbps 1216 kbps 216 kbps 1280 kbps 224kbps 1344 kbps 232 kbps 1408 kbps 240 kbps 1472 kbps 248 kbps 1532 kbps 256 kbps Auto 192 272 kbps Auto 200 288 kbps Auto 224 304 kbps Auto 256 Dolby Digital plus data rates Dolby Digital plus AUTO data rates Dolby Digital plus minimum data rates acmod Auto 192 ...

Page 14: ...uto 88 kbps 304 kbps HE AAC v1 Auto 96 kbps 320 kbps HE AAC v1 Auto 100 kbp 350 kbps HE AAC v2 Auto 112 kbp 384 kbps HE AAC v2 Auto 128 kbp 400 kbps HE AAC v2 Auto 144 kbps 448 kbps HE AAC v2 Auto 156 kbps 512 kbps acmod AAC HE AAC v1 HE AAC v2 min max min max min max 1 0 24 kbps 288 kbps 24 kbps 64 kbps 24 kbps 64 kbps 2 0 32 kbps 576 kbps 64 kbps 128 kbps 48 kbps 48 kbps 2 1 48 kbps 800 kbps 44 ...

Page 15: ...r 2 is using program 2 Metadata Reversion Mode last used preset Metadata Reversion Preset 16 Above you have seen the common parameters for all encoding modes If you turn on Dolby Digital plus or the various encoding modes for Dolby pulse AAC modes the available encoder settings will be extended by the ones described below acmod 1 0 2 0 2 1 2 2 3 0 3 1 3 2 GUI label AAC Auto 56 256 56 96 156 200 15...

Page 16: ...f on You may turn the auto mixing off and on here Trigger Level dBFS 0 95 The ducking circuit measures the level of the voice over input signal Here you define the detection level that will trigger the ducker Trigger Delay Time ms 0 4992 The time it takes from the moment the ducker is triggered to the moment the ducker begins to reduce the external program level the main audio program Trigger Hold...

Page 17: ...d days of analog stereo transmission the left channel carried the main program converted to mono and the right channel the AD mono mix When digital TV showed up and provided 4 audio tracks for transmission both programs have been transmitted in stereo Everybody will understand that this eats up a lot of precious bandwidth Today we are able to do the receiver mix and it needs much less bandwidth to...

Page 18: ...encoder C8612 18 20 METADATA ENC 1 Shows the set of metadata which are relevant for the first encoder Above you see an example of a set of metadata which are coming from the bus They are partially overwritten Below the remaining metadata of the expert area if you scroll down the page ...

Page 19: ...e values at any time If the source is Bus Preset you may partially overwrite it as long as there are valid metadata at the input If there are no valid metadata at the input the module enters the Reversion Mode For the reversion preset such overwrite checkboxes will not be displayed And a hint is given If you switch Reversion Mode to last used you may load any preset and you will get the check boxe...

Page 20: ...PI O module C8817 it will put an associated number on the CAN bus see C8817 manual for details Each module in a frame is permanently listening for such numbers and compares them with above settings You can also assign GPO numbers which will indicate the respective action E g if a Preset x is loaded the C8612 puts the associated GPO number on the CAN bus The GPI O module permanently listens for suc...

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