Buzzing on GSM audio

Joerg Reisenweber joerg at
Sun Jul 27 00:43:14 CEST 2008

Am So  27. Juli 2008 schrieb Dave Clark:
> I've seen a couple articles explaining that the buzz in GSM systems is 
> at a fundamental frequency of 217hz and its harmonics, due to TDMA 
> transmission. It would seem to me that a graphic equalizer that 
> suppresses these audio frequencies might be more effective... Any thoughts?
Can't be done, we need this freq for voice. Also it's very spread spectrum and 
you simply can't filter it (at least with the CPU-power we got on FR).

This has to be fixed at root, and root cause is an audio path sensitive to RF.
We need to find the "hole in the shield" and close it.

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