Mic volume extremely soft after buzz fix with SHR unstable
openmoko at mazikeen.demon.co.uk
Mon Feb 22 14:03:38 CET 2010
On Sunday 21 February 2010, Jan Girlich wrote:
> after I got my gta02 A06 a hardware buzz fix late December last year the
> mic is very soft with the newest SHR unstable. So I had a look at all
> the different tips around and carefully read all emails of the thread
> "Experiment: better sound on remote end" and all links mentioned in
> there and tried all the suggested tweaks and got rid of any static or
> noise, but the mic still is so soft that I literally have to yell at my
> phone from close distance in order to be hardly understood by the
> What could be the problem? Any suggestions on what I could try to set
> the mic volume to a usable level? Could the problem be related to the
> buzz fix?
IIRC the buzz fix reduces the sensitivity of the mic input slightly.
> After fiddling around with the settings for a long time I ended up with
> setting the controls in the gsmhandset.state file back to these values.
> The other values are untouched.
> * control.48: 3
> * control.63: 'Mic 2'
> * control.12: 7
> * control.5: 115
Controls 48 and 12 are on maximum, while control 5 has 12 steps remaining. You
still have scope to make the mic a fair bit louder if you need to. 3, 5 and
121 would give the same volume level with less chance of distortion.
Desc. Range Chan Setting
Mic2 Capture Volume +12dB - +30dB / 6dB steps 48 0-3
Mono Sidetone Play Vol. -15dB - +6dB / 3dB steps 12 0-7
Mono Playback Volume -73dB - +6dB / 1dB steps 5 0-127 (but 0-47 are mute)
-76dB - +42dB / 1dB steps => 119 steps (120 with mute)
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