[Speex-dev] AGC on a phone conversation

Andras Kadinger bandit at surfnonstop.com
Tue Aug 23 02:48:17 PDT 2011


2011.08.19. 5:59 keltezéssel, Yanick Bourbeau írta:
> I have a recorded conversation from an analog trunk. As usual one side
> is stronger that the other one.
> In my case, the gap between signal levels are even bigger.
> How does speex AGC preprocessor will perform on this type of audio
> recording?
> Maybe I am wrong and AGC is not really what I need to equalize the two
> persons in my phone conversation?
> As I Understand, AGC will perform better if each party is recorded in a
> different channel?
Yes, this is correct, I definitely recommend AGCing the two parties 
separately. Otherwise, if you tried to AGC the two parties mixed into a 
single channel, the AGC would have to keep readjusting between two very 
different levels/environments all the time, which would give much worse 
results. With separate channels, each AGC only has to home on to the 
level on that channel just once, at the beginning, and then just follow 
that with small adjustments.
> Thank you,
> Yanick Bourbeau

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