GSM buzz and gsmhandset.state

Jan R jan.random at
Thu Oct 23 20:35:57 CEST 2008

On Thu, 23 Oct 2008 17:48:51 +0100, Andy Green wrote:

> As I understood what Matt explained today, it seemed there was a danger
> that what these changes did was simply attenuate all the mic audio alike
> along with the buzz.
> It would be highly interesting clue if that was not the case...

If I am not horribly mistaken by all the knobs and dials that I turned, 
it is actually possible to have higher mic amplification when mic audio 
is routed through PGA than otherwise. Signal to noise ratio (or rather 
signal to buzz ratio) is getting way better!

I just made another test call with the original profile (no buzzing this 
time, bummer) and then switched to the modified gsmhandset.state and back 
repeatedly. The modified profile made a faint buzzing appear - however, 
mic audio was louder on the receiving end of the conversation. It was 
described to me to be just like the difference between being talked to by 
a person facing away from you (original profile) and a person talking to 
you face to face (modified profile).

Another point made was that mic amplification seems to be a little high 
with my new settings, resulting in a bit of distortion or clipping.


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