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how capture audio from a headphone with microphone using dsP

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ransiluj

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hey friends,
i'm doing noise suppression and communication project. what i basically doing is I'm going take the speech from the microphone that in headphone. and i have another mic and i'm taking background noise from that. Then i'm giving that noise and voice to dsPIC30f4011. i want know how i detect sound coming from the microphone using dsPIC. I have no idea about it. Please help me.
thank you
 

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