[SBE] Looking for an audio switcher - I think...

[Curt Yengst]

Good point, Gary.  Hadn't thought of that.


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From: sbe-bounces at sbe.org [sbe-bounces at sbe.org] on behalf of Gary Blievernicht [garybliev at yahoo.com]
Sent: Monday, October 17, 2011 3:43 PM
To: sbe member discussion mail list
Subject: Re: [SBE] Looking for an audio switcher - I think...

Generally with HDSDI the audio is embedded inside the video, check that the recorder is set to decode the embedded audio.  You will need to make sure you are decoding the audio that is embedded into the signal.


>From the wikipedia:

http://en.wikipedia.org/wiki/Serial_digital_interface#Embedded_audio
Embedded audio
Both the HD and SD serial interfaces provide for 16 channels of embedded audio. The two interfaces use different audio encapsulation methods - SD uses the SMPTE 272M standard, whereas HD uses the SMPTE 299M standard. In either case, an SDI signal may contain up to sixteen audio channels (8 pairs) embedded 48 kHz, 24-bit audio channels along with the video. Typically, 48 kHz, 24-bit (20-bit in SD) PCM<http://en.wikipedia.org/wiki/PCM> audio is stored, in a manner directly compatible with the AES3<http://en.wikipedia.org/wiki/AES3> digital audio interface. These are placed in the (horizontal) blanking periods, when the SDI signal carries nothing useful, since the receiver generates its own blanking signals from the TRS.
In dual-link applications, 32 channels of audio are available, as each link may carry 16 channels.

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If you are running audio externally to the video, you will likely need to switch AES/EBU (PCM) audio.
Here is a link to some to get you started:
http://www.broadcast-devices.com/BDI%20Audio%20Products.html

The data sheet says: Fully Remote Control Ready - Parallel standard, serial inferface <sic> optional

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If you are receiving from Satellite, and then switching to recorders, you might need to check that the Dolby Decoder (or MPEG) is set to decode the audio, else you'll have to deal with that downstream.

good luck.



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