Red Hat Bugzilla – Bug 489437
poor quality microphone recordings in VoIP apps
Last modified: 2009-12-18 03:59:22 EST
Description of problem:
On both my FC8 desktop and FC10 laptop (both Intel 82801G soundcards), microphone records are poor quality. Specifically "s" sounds come through staticy. If I use Ekiga or Twinkle, I get the problem, but if I use Skype - it's fine.
Under FC8 I don't use pulseaudio - just straight ALSA, but under FC10 I use pulseaudio - so I'm assuming the fact that I have identical problems on both makes this an ALSA problem?
I googled around and after much experimentation can duplicate the problem using ALSA tools.
makes an 8bit, 8000 Hz recording, and contains the "staticy 's'" problem. If I do it again as
arecord -f cd sample.wav
the recording is 16bit, 44100 Hz and sounds beautiful.
Version-Release number of selected component (if applicable):
alsa-lib-1.0.16 and alsa-lib-1.0.19. pulseaudio-0.9.14-1.fc10
Steps to Reproduce:
1. start ekiga/twinkle
2. make call
3. listen to recipient says "ewww - what's wrong with your mic?"
poor quality voice
should sound better than it does
Well, it's not codec-related.
It smells to me like Skype is exclusively using "high quality" recordings (ie 16bit) whereas ekiga/Twinkle use defaults - and end up with poor 8bit? I can't see any way of making the apps directly do things differently so am at a loss how to fix this.
Thanks for any help
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