Difference between revisions of "Control Room Audio Solution"

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=Description/Objective=
 
=Description/Objective=
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In this example, we will be building 1 sim rooms with an overhead speaker and 1 observation room with live audio and a talkback microphone. For physical devices, we will have 1 room microphone, 1 camera, 1 OWISP, and 1 PSP speaker (and/or SHM-1 headphone amp).  
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In this example, we will be building 1 sim rooms with an overhead speaker and 1 observation room with live audio and a talkback microphone. For physical devices, there will be 1 room microphone, 1 camera, 1 OWISP, and 1 PSP speaker (and/or SHM-1 headphone amp).  
  
 
=Physical Wiring/Line Diagram=
 
=Physical Wiring/Line Diagram=
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We will need 2 inputs and 3 outputs. The inputs and outputs should be as follows:  
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2 inputs and 3 outputs will be needed. The inputs and outputs should be as follows:  
 
#* Input 1: Sim Room Mic
 
#* Input 1: Sim Room Mic
 
#* Input 2: Control Room Talkback Mic
 
#* Input 2: Control Room Talkback Mic
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[[File:CRAS_Line_Diagram.png|link=https://ipivs.com/wiki/images/2/2e/CRAS_Line_Diagram.png|500px]]
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{{img | file = CRAS_Line_Diagram.png | width=500px}}
  
 
=Tesira Software=
 
=Tesira Software=
  
 
==Connections==
 
==Connections==
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# Once we've completed our physical connections, open the Tesira software and build a configuration.
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# If the physical connections are complete, open the Tesira software and start building a configuration.  
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# In this configuration we'll be using the following blocks. Add these blocks to the configuration:  
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# In this configuration use the following blocks:  
 
#* TesiraFORTE CI block ("per channel" AEC reference mode)  
 
#* TesiraFORTE CI block ("per channel" AEC reference mode)  
 
#* Peak Meter x 3
 
#* Peak Meter x 3
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#* Matrix Mixer with at least 2 inputs and 3 outputs, with 2 extra outputs
 
#* Matrix Mixer with at least 2 inputs and 3 outputs, with 2 extra outputs
 
#Connect the blocks as follows:  
 
#Connect the blocks as follows:  
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#* The Tesira Input block will already be connected to the AEC block, so connect the first peak meter to the Input block also. This will help us to be sure we have the proper levels set on the preamp.  
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#* The Tesira Input block will already be connected to the AEC block, so connect the first peak meter to the Input block also. This will help ensure proper levels are set on the preamp.  
 
#* Connect the AEC block to the Uber Filters.  
 
#* Connect the AEC block to the Uber Filters.  
 
#* Send the Uber Filters to the Level Block.  
 
#* Send the Uber Filters to the Level Block.  
 
#* Send the Level Block to the Compressor and the second peak meter.  
 
#* Send the Level Block to the Compressor and the second peak meter.  
 
#* Send the Compressor to the Matrix Mixer.  
 
#* Send the Compressor to the Matrix Mixer.  
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#* Connect output 1-3 from the mixer to port 1-3 on the Tesira Output block AND to the third peak meter. This way we can make sure to reach the right audio levels before we send it to the cameras.  
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#* Connect output 1-3 from the mixer to port 1-3 on the Tesira Output block AND to the third peak meter. This will ensure the right audio levels are sent to the camera.  
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#* Connect the 2 extra outputs from the Matrix Mixer to ports 1&2 on the AEC reference. More on AEC in a minute.  
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#* Connect the 2 extra outputs from the Matrix Mixer to ports 1&2 on the AEC reference.  
  
  
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When we're complete, our file should look something like this:  
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When this is complete, the file should look something like this:  
  
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[[File:CRAS_Config.png]]
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{{img | file = CRAS_Config_2.png}}
  
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==AEC Block==
  
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{{img | file = CRAS_with_Input_Blocks.png}}
  
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#Phantom Power: The mics will need phantom power, and proper levels on the preamps. Use the peak meter to gauge the audio levels so that optimal dialog peaks between -12 and 6 dB.
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#AEC: For the first time in the example configurations, Acoustic Echo Cancellation will be used. The reason for this is: anytime there is a microphone and a talkback speaker in the same room, there is the opportunity for an echo and/or feedback. AEC will cancel the delayed audio or feedback. Enable the AEC feature with this button on the AEC Block. AEC is explored in depth in another section.
  
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==Matrix Mixer for ORAS with Software Talkback==
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==Acoustic Echo Cancellation==
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AEC is important, and sometimes difficult to understand. There is a separate section on how to configure AEC. Click the image below to read up on AEC:
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 +
{{img | file = AEC.png}}
  
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[[File:ORAS_with_Software_Talkback_Blocks_2.png]]
 
  
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#Phantom Power: We will need phantom power on for our room mics, and proper levels on the preamps.
 
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#AEC: For the first time in our example configurations, we are going to use Acoustic Echo Cancellation. The reason for this is: anytime we have a microphone and a talkback speaker in the same room, there is the opportunity for an echo. If John is in the control room using the software to talk to Steve, who is in the simulation room, the room mic will pick up John's voice from the OWISP, and John will once again hear his own voice in the control room with a short delay. AEC will help us cancel this delayed audio. Enable the AEC feature with this button on the AEC Block.
 
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#Output Channels: 3A highlights the output channels to the devices for the first pair of ORAS rooms; 3B indicates the devices for the second pair; and 3C highlights the AEC reference channels.
 
  
  
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For further insight about the other processing blocks and settings, refer back to the first configuration example, or click the image below:  
 
For further insight about the other processing blocks and settings, refer back to the first configuration example, or click the image below:  
  
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[[File:Simple_Config.png|link=https://ipivs.com/wiki/Simple_Configuration#Processing_Blocks_in_Tesira]]
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{{img | file = Processing_Blocks_Page.png}}
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==EQ and Compression==
 
==EQ and Compression==
  
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For information on EQ settings and compression, refer to Simple Configuration with EQ and Compression, or click the image below:  
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For information on EQ settings, or click the image below:  
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{{img | file = EQ_Page.png}}
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[[File:One_Complex_Config.png|link=https://ipivs.com/wiki/Simple_Configuration_with_EQ_and_Compression#Processing_Blocks_in_Tesira]]
 
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=How AEC Works=
 
  
  
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[[File:ORAS_with_Software_Talkback_AEC2.png]]
 
  
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John is in the observation room, using the talkback feature. His audio is what's in danger of being captured and returned to him
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For Compression parameters, click the image below:
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{{img | file = Compression_Page.png}}

Latest revision as of 09:30, 10 May 2022

Description/Objective

In this example, we will be building 1 sim rooms with an overhead speaker and 1 observation room with live audio and a talkback microphone. For physical devices, there will be 1 room microphone, 1 camera, 1 OWISP, and 1 PSP speaker (and/or SHM-1 headphone amp).

Physical Wiring/Line Diagram

2 inputs and 3 outputs will be needed. The inputs and outputs should be as follows:

    • Input 1: Sim Room Mic
    • Input 2: Control Room Talkback Mic
    • Output 1: Camera in Sim Room
    • Output 2: OWISP in Sim Room
    • Output 3: Control Room Speaker/HP Amp


CRAS Line Diagram.png

Tesira Software

Connections

  1. If the physical connections are complete, open the Tesira software and start building a configuration.
  2. In this configuration use the following blocks:
    • TesiraFORTE CI block ("per channel" AEC reference mode)
    • Peak Meter x 3
    • Uber Filter x 2
    • Level Block
    • Compressor with 2 channels, "ganged mode" and "advanced curve"
    • Matrix Mixer with at least 2 inputs and 3 outputs, with 2 extra outputs
  3. Connect the blocks as follows:
    • The Tesira Input block will already be connected to the AEC block, so connect the first peak meter to the Input block also. This will help ensure proper levels are set on the preamp.
    • Connect the AEC block to the Uber Filters.
    • Send the Uber Filters to the Level Block.
    • Send the Level Block to the Compressor and the second peak meter.
    • Send the Compressor to the Matrix Mixer.
    • Connect output 1-3 from the mixer to port 1-3 on the Tesira Output block AND to the third peak meter. This will ensure the right audio levels are sent to the camera.
    • Connect the 2 extra outputs from the Matrix Mixer to ports 1&2 on the AEC reference.


When this is complete, the file should look something like this:

CRAS Config 2.png

AEC Block

CRAS with Input Blocks.png

  1. Phantom Power: The mics will need phantom power, and proper levels on the preamps. Use the peak meter to gauge the audio levels so that optimal dialog peaks between -12 and 6 dB.
  2. AEC: For the first time in the example configurations, Acoustic Echo Cancellation will be used. The reason for this is: anytime there is a microphone and a talkback speaker in the same room, there is the opportunity for an echo and/or feedback. AEC will cancel the delayed audio or feedback. Enable the AEC feature with this button on the AEC Block. AEC is explored in depth in another section.

Acoustic Echo Cancellation

AEC is important, and sometimes difficult to understand. There is a separate section on how to configure AEC. Click the image below to read up on AEC:

AEC.png



Processing Blocks in Tesira

For further insight about the other processing blocks and settings, refer back to the first configuration example, or click the image below:

Processing Blocks Page.png

EQ and Compression

For information on EQ settings, or click the image below: EQ Page.png


For Compression parameters, click the image below: Compression Page.png

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