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    Why must the sampling rate be twice the sampling component? I know human cant hear above 20khz and therefore signal has to be sampled at 40khz. But why? is this to get a lot of detail?
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    Probably you mean kHz rather than Hz

    It's the fairly well known result of Nyquist sampling theorem - in effect it's the limit on the frequency of an analogue signal you can recover from discrete samples without 'aliasing' i.e. creating artifacts in the recovered analogue signal.
 
 
 
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