smartphone speech processing

0day

Honorable
Apr 15, 2013
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10,510
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Hello all,
I have a question regarding to smartphone's architecture and its speech processing, we know that the baseband processor has DSP chip that is responsible for
and it has DAC and ADC units.

My question is why do we need to these units? my understanding is that the audio wave would be converted from analogue to digital once it passes the microphone!!! Please correct me if I am wrong ...

Please, I need to help quickly?

Thanks,
 
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