smartphone speech processing

[0day]

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,

 

[Apanzee]

This is an article on speech recognition. It covers a pretty broad spectrum from smart phones and computers, to automated telephone systems like those you deal with when you call most major corporations.

http/electronics.howstuffworks.com/gadgets/high-tech-gadgets/speech-recognition.htm

 

[0day]

Thanks,,, that really helps.