Anyone using FR as a phone?
openmoko at mazikeen.demon.co.uk
Mon Jul 21 10:36:15 CEST 2008
On Monday 21 July 2008, Cédric Berger wrote:
> Sound quality during calls is indeed not that good.
> 1. Volume is usually too low, but I think it can be modified via
> correct settings.
> Seems like people not always hear me at the same level : sometimes
> quite ok, often really too low. I have yet to try more...
Volume can be adjusted vi a alsamixer, and the mic can be routed via a
compressor and noise gate. Audio routing is far from simple - see the wiki:
The route indicated for voice calls on the wiki is via the compressor / noise
gate (ALC) but the state file (2007.2 after opkg upgrade) skips that part.
Assuming there is sufficient difference in level between voice level and the
level from the earpiece it should be possible to set the noise gate so that
it only triggers when you are actually speaking, stopping the echo. The
compressor should even out the variations in level.
I don't know yet whether the assumption is true; it maybe that the ALC is
skipped from the state file because it was difficult or impossible to find
settings that reliably blocked echo, but passed voice.
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