GSM security question, mic directly connected to the GSM chip? Re: GPLv3 and Mobile Phones

Richard Franks spontificus at
Tue Dec 12 17:03:24 CET 2006

Hurrah Robert!

I'm not an audio engineerologist, however a quick read of the
datasheet shows input/output rates of up to 96kHz.. so the theoretical
highest frequency at that level would be 48kHz.. meaning there may be
room in the non-audible spectrum for comms depending upon the
sensitivity of the mic/speaker components.

Is anyone else excited about having a 96Khz ADC with programmatic
access in their pocket?

I'm still a bit fuzzy regarding whether there is a physical wire
connecting the microphone to the GSM (has its own ADC?), or whether
the 2401 provides the GSM with the converted digtal stream?


On 12/12/06, Sean Moss-Pultz <sean_mosko at> wrote:
> On 12/12/06 9:43 PM, "Robert Michel" <openmoko at> wrote:
> > BTW: Do you have some more info for us about the audio/soundcard?  ;))
> > stereo(?) audio out, 2,5mm jack, frequency 20(?)-20000(?)Hz
> > stereo(?) audio in(?), 2,5mm jack(?), frequency 20(?)-20000(?)Hz
> Only because it's you who asked ;-)
> -Sean
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