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digital audio 
modular 
processing system

 

C8000

 

16 channel DSP 

C8092

 

   

page

  19/24

 

 

DSP 2B – 5.1 + 2 mode 

 
If you have bought the surround option you will get the option to do an upmix either for permanent 
operation or as a fail over feature to maintain a surround image if the input surround signal disappears. 
Also a downmix block is available that can be used to feed a stereo program path or it may be used as 
a fail over source for the stereo path. 
Beside the upmix algorithm, the upmix block has a surround detector that will decide if an input 
surround signal has disappeared under certain conditions: 
 

 
Fail Over C (Upmix) 

This can be used to provide a two stage fail over in case of upmix. 

 

The upmix source signal can be either the incoming L/R surround pair 
"Primary" or an extra two channel input "Secondary". 

 

If the surround input is driven by an upstream Dolby E decoder and the 
signal changes from decoded D-E to PCM stereo on L/R, this stereo 
will for example be used as an upmix source. But it may also be 
desirable that in case surround fails a different input is used as the 
upmix source or the upmix is performed permanently from the 
secondary input. 

Содержание C8000

Страница 1: ...riants 8 16 processing channels Surround processing 5 1 Level Magic Automatic Upmix from stereo or mono Surround fail over via Upmix Downmix Block diagram C8492 Carrier Board SYNC System sync inertface MODULE CONTROLLER CAN BUS interface System bus interface 32 lines I O 2 8 Ch mux Audio Router GPI O handling Routing control Frame Controller commmunication Preset management Front Panel status disp...

Страница 2: ...essor of the C8086 since it combines LevelMagic loudness control with stereo and or surround fail over functions inluding 5 1 downmix and 5 1 upmix Technical specifications Power Supply 5Vdc 4 75 5 25V max 1 200mA Dimension 3RU 4HP 160mm depth DIN41612 backplane connector Environmental Operating temperature 0 40ºC Non operating 20 70ºC Humidity 90 non condensing General Features 16 processing chan...

Страница 3: ...FF CAN bus speed 256kBit s ON CAN bus speed 1Mbit s Important Note For a limited number of modules like the C8092 it is possible to communicate with a CAN bus speed of 1MBit s This provides more bandwidth to move measuring data from the module via the frame controller to the J AM based loudness logger Be sure that all modules within a frame are operating with the same CAN bus speed 3 OFF Internal ...

Страница 4: ...e 4 24 Web browser based GUI OVERVIEW The module overview of a frame below the display of an example frame By simply clicking on the spanner tool symbol you will get the control pages of the C8092 and the status pane on the left hand side which is also shown on mouse over ...

Страница 5: ...he actual loaded preset Failover Upmix Preset Name of the actual loaded preset BYPASS grey red DSP1 DSP2 turns red if a bypass is activated Bit Transparent shows the bit transparent status of the Ch 01 02 07 08 respective DSP channel pairs Ch 09 10 15 16 Failover Upmix turns green if function is active A B Upmix 1 C D Upmix 2 Bus Input Status Error status of the bus inputs see ROUTING Processing S...

Страница 6: ...digital audio modular processing system C8000 16 channel DSP C8092 page 6 24 PRESETS Example for the C8092 16S ...

Страница 7: ... as well as 9 10 and 11 12 Channels 13 14 15 16 belong to mono programs whereas channel 15 16 are not part of the preset currently loaded Here another example where channels 15 and 16 are not part of the actual loaded preset Save as Select a preset NV memory number Name Assign the preset a name up to 16 digits and press SAVE Channels stored The check boxes define which channels will be stored when...

Страница 8: ...mber Name Assign the preset a name up to 16 digits and press SAVE Processing blocks The check box es define from which processing block parameters stored in preset will be stored next The number of processing blocks involved depend on the operating mode for the DSPs Preset Clipboard COPY TO CLIPBOARD copies the active preset to a clip board the data may be used by other modules inside the same fra...

Страница 9: ... the module undergoes revisions where parameters may be added while others become obsolete The parameter version indicates it Important Note It is mandatory to initialize the module to factory defaults if the parameter version has changed in order to clean the memory from rubbish data Otherwise you may experience malfunctions FIRMWARE displays the firmware versions of the C8092 components Controll...

Страница 10: ...resets from File Pressing RESTORE will overwrite all active parameters and the content of the presets with the content from the backup file ROUTING The bus interface allows for very flexible interconnection from and to the c8k audio busses either in two channel or eight channel multiplex mode The inputs to the DSPs Ch 01 02 Ch 15 16 exclude each other see example below You can select a specific DS...

Страница 11: ...roller summarizes such status information and generates SNMP traps for the frame as an entity or may activate GPOs if a GPI O module is installed The SNMP manager may afterwards poll the modulesStatus for more detailed status information per input see SNMP documentation for details Enable Bus Driver ON OFF You can disable the output drivers by un checking the Enable Bus Driver check box The state ...

Страница 12: ...DSPs Below an example where DSP 1 is configured for 5 1 2 whereas DSP 2 is configured for 4 x 2 program processing Alternative Input Due to the fact that the DSP is fed in 2Ch mode and in case of Channel Allocation surround operation it is possible to select between the standard TV broadcast L R C LFE Ls Rs and the alternative movie picture L C R Ls Rs LFE channel allocation Alternative Output See...

Страница 13: ...SP C8092 page 13 24 Important Note The available number of processing channels depends on the license that is enabled for the particular module Here is an example for the basic configuration that has four processing channels only no channel license is enabled ...

Страница 14: ...you may download from our web site Operating Mode 5 1 2 4 x 2 defines the number of audio channels which are used for one audio program All relevant processing blocks will be configured to meet the selected mode Loudness Control Mode Level ITU BS 1770 1 2 3 4 EBU R 128 ARIB TR B32 ATSC A 85 2011 7 2013 Free TV OP 59 Porteria 354 Bypass ON OFF The processing parameters will be bypassed to validate ...

Страница 15: ...or as well Processing Profile live speech pop classic Loudness Target dBFS Level mode 0 50 LKFS ITU mode 0 50 LUFS EBU mode 0 50 Time s min h 10 20 40 sec 1 2 5 10 20 40 min 1 2 h Max Gain dB 0 40 Freeze Level dBFS 20 60 Transient Processor Max Gain dB 0 40 Response soft mid hard Limiter ON OFF Processing Profile live speech pop uni classic Max True Peak dBTP 0 0 20 Expander ON OFF Threshold dBFS ...

Страница 16: ... audio signals pass through without the DSP processing to maintain data structure for non audio signals Expert show don t show The expert mode offers the possibility for manual intervention of the adaptive behavior of the LevelMagic process for critical material For details pls see the above mentioned document Clear Processing History manually or GPI controlled Preset disable enable defines if the...

Страница 17: ...rimary Secondary AUTO Selection between both inputs and the auto mode Dual Mono OFF AUTO If the fail over input is fed by a dual mono signal the circuit may automatically copy the opposite one if one fails Fail Threshold dBFS 60 40 Trigger threshold for the fail detector Fail Wait s 1 5 10 0 Time from detection of an audio loss to the moment of switch over Fail Return s 0 0 10 0 Time from the dete...

Страница 18: ... example above shows a condition where the LFE is not linked to the other surround channels and may be controlled independently The remaining two channels may be used for an independent stereo audio program or for two mono channels Above it is linked for stereo operation Depending on the loudness control mode the link options are different While ITU defines a certain link condition for loudness co...

Страница 19: ...e upmix block has a surround detector that will decide if an input surround signal has disappeared under certain conditions Fail Over C Upmix This can be used to provide a two stage fail over in case of upmix The upmix source signal can be either the incoming L R surround pair Primary or an extra two channel input Secondary If the surround input is driven by an upstream Dolby E decoder and the sig...

Страница 20: ... to the surround input or the upmix output but it may also perform an AUTO switch over in case the surround input fails Detection Center Surround Center or Surround Signal loss Here you can decide which channels must be observed for signal loss to operate the surround switch Fail Threshold dBFS 80 70 40 If the RMS weighted input level drops below this value a fail signal will be generated Fail Wai...

Страница 21: ...ar effects Processing Time ms 3 100 The processing time has great influence on the quality of the upmix process but of course alters the latency of the audio signal It is highly recommended to allow as much processing time as possible E g one can e g increase the processing time instead of adding audio delay to compensate for a delayed video line Depending on the system latency requirements ingest...

Страница 22: ... Gate function the system interactively processes the subwoofer signal and generates a signal that comes very close to a real LFE signal without creating permanent rumble and bass excitation LFE Cutoff Freq Hz 60 80 100 120 sets the cutoff frequency for the generated LFE signal LFE Gain dB 20 0 20 0 You can set the LFE level here LFE Effect Gate 20 0 0 0 Threshold dB sets the relative threshold of...

Страница 23: ...e GPIs are useful if you want to recall settings remotely e g via presets The C8k frame can handle 127 different virtual GPI numbers You must assign a unique number to the respective function Such numbers will be generated by the brc8x Broadcast Remote Controller or by a GPI O interface module C8817 If the C8092 receives such a number over the internal CAN bus it will for example load the respecti...

Страница 24: ...092 puts the assigned number on the CAN bus so a C8817 GPI O module can engage a relay or the brc8x may activate its tallies Important Note Virtual GPI and GPO numbers do not see each other on the CAN bus I e you can t use a GPO number to trigger an event inside the frame directly If this is the task you must use the C8817 GPI O module that can do the GPI O conversion and provides you with the pos...

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