Bying a Freerunner with the "buzz"-fix on it
joerg at openmoko.org
Tue Apr 21 02:56:51 CEST 2009
Am So 19. April 2009 schrieb Daniel Willmann:
> On Wed, 15 Apr 2009 01:09:15 -0300
> Werner Almesberger <werner at 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.
yup, for sure
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