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AGC in usb-audio devices

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AGC in usb-audio devices

Subject: AGC in usb-audio devices
From: Bob Stuller <email@hidden>
Date: Thu, 8 Nov 2007 20:48:32 -0500

Folks, Greetings!

Can anyone tell me what is the state of Automatic Gain Control (AGC) in Core Audio? In Sound Manager we would routinely turn off AGC on all input devices. Since I don't see any mention of AGC in the headers, I've always assumed that Core Audio wasn't giving us that control over the devices. And, because I assumed that all devices would default to 'AGC Off', I thought that was a-okay.

So, now that we seem to see signs of AGC being on in certain USB Audio devices, I have a couple of related questions. First, is there a way to examine the state of AGC on arbitrary (probably usb) input devices? Is there a way to turn it off if it's on? I'm betting that there are folks here who know a lot about this subject - including whether there are usb audio devices that run by default with some sort of agc turned on.

Peace,
Bob
--

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