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It is possible to do stereo recording? At least, there are unsoldered pin's for stereo microphone on PCB?
Is it possible to output some audio stream on the headset and in case of an incoming call to (optionally) lower this output, and additionally output the ringtone on the stereo speaker? Or is this not possible due to hardware limits (guess this would require full-duplex output)?
Is it possible to:
- record my sound from MIC , put it to a system audio_in, do some DSP on PCM data stream, then
pass it to GSM_in (analog or digital whatever), and vice versa
- get analaog GSM_out (or prefered digital) in system as another audio_in (separate audio stereo channel - duplex prefered) do DSP on recorded PCM from GSM (for example modify) and get it out to speaker
I suppose that for full duplex this will require some audio subsystem that can have 2x in/out processing, unless there is some way to process each stereo channel for separate direction of communication ? will this require some soldering on board ?