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From: Marcus Bauer <marcus.bauer@gmail.com>
To: Support for Openmoko Device Owners <support@lists.openmoko.org>
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Date: Tue, 05 Aug 2008 20:04:57 +0200
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Subject: Re: Buzzing sound
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On Tue, 2008-08-05 at 18:56 +0800, Joerg Reisenweber wrote:

> Local has never been a related issue. It's always far end that "get's the 
> buzz". Quite basic and important to understand. We have *two* distinct 
> audio-transfers with opposite directions. Buzz is on 
> FR->(mixer,GSM)->far_end only.
> If you hear local buzz, your mixer/gsm-sidetone settings are somewhat 
> incorrect.
> 
> I'd appreciate such a wikipage and the reports there very much.
> Additional needed info: GSM-band (we don't know all providers!), signal-level 
> GSM
> In fact that's what I did in Germany, collect reports from users about noise. 
> I even had them call my answering machine so I actually collected some real 
> audio samples as *.wav. Result: in Germany it's virtually only E+ that's 
> causing the noise.
> 
> Anyway still this makes no database for a guess on percentage of users that 
> suffer from complaints of their callees about buzz-noise.

Just to add to the E+ 900 vs. 1800: 
Orange France uses 900/1800 and my phones all suffer from the buzz but
not always and not reproducibly. Except with the headphones, they can
make it so loud the communication becomes impossible. 


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