Buzzing on GSM audio
Timo Jyrinki
timo.jyrinki at gmail.com
Sat Jul 26 14:43:40 CEST 2008
2008/7/26 Andrew Bruno <aeb at qnot.org>:
> FWIW, I've found tweaking these specific settings in
> /usr/share/openmoko/scenarios/gsmhandset.state effect the intensity of the
> buzzing sound. Specifically:
>
> * 'Mono Playback Volume' (85)
> * 'Mono Sidetone Playback Volume' (7)
> * 'Mic2 Capture Volume' (3)
(buzz)
...
> * 'Speaker Playback Volume' (112)
> * 'Bypass Playback Volume' (7)
(echo)
Thanks! With these tweaks to my current settings, I've successfully
for the first time received a confirmation that the receiver of my
call didn't hear an echo of her own voice.
However, I did tweak "Mono Sidetone Playback Volume" from 7 to 4,
since in my own testings with two phones I heard quite a lot of buzz
still. That lessened it, and the receiver seemed to hear my well
enough anyway.
My paranoid / not-knowing-what-I-do procedure is to:
1. change /usr/share/openmoko/scenarios/gsmhandset.state
2. alsactl -f /usr/share/openmoko/scenarios/gsmhandset.state restore
3. alsactl -f /etc/asound.state store
4. reboot
I now added a link to your post at
http://wiki.openmoko.org/wiki/Freerunner_Hardware_Issues#Poor_Audio_Quality
since this is the first time I really achieved some good results.
-Timo
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