How can to digitalis an input voltage with sampling.

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Hi All,
I am currently tasked with a project that requires us to design, build and test a digital stethoscope. We are required to take the input sound from a simple microphone circuit and to put it through Matlab and present the processed signal.
I am struggle to design the code that will be able to sample the input sound under the Nyquist theorem as well as displaying the result on a GUI.
Any help would be much appreciated.

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