On Wed, 15 Apr 2009 01:09:15 -0300 Werner Almesberger <wer...@openmoko.org> wrote:
> Joerg Reisenweber wrote: > > There's a way to detect buzzfix by rapidly switching on and off > > MICBIAS and testing if you "hear" some buzz when recording from > > builtin mic. Werner has created a small program to do the switching > > job. > > I'm actually not sure if this approach works. You can hear the > ~40-50 Hz buzz that program (*) generates well enough, but when > I added a "buzzfix" capacitor, that artificial noise was still > there. > > It could be that I did something wrong, though, including not > actually applying the buzz fix. Maybe switching MICBIAS on and off creates an amplitude orders of magnitudes higher than than the one introduced with GSM. Regards, Daniel Willmann
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