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QPSK modulation of Mic input in simulink

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sumi84

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mic input +simulink matlab

Hi!
I'm a beginner in simulink and I'm trying to input an audio signal through the mic using "from audio device" block and modulate it using qpsk mapping and again demodulate it and listen to the output using the "from audio device" block.
I think that i have to convert the audio input to digital, but i don't know how to convert it using an A to D converter.
Please help me in A to D conversion and the integration of the above block sets.
Thanks in advance.
 

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