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The Nyquist Sampling Theorem

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  • Using a low frequency digitizer to digitize a high frequency waveform

Sometimes we can use aliasing to our advantage. Suppose we use an anti-aliasing filter that passes signals from 11 to 13 KHz, and we sample the filtered signal with a 7 KHz digitizer. Over what range of frequencies would the signals appear? Use the discussion of modulus and aliasing above to compute the range of observed frequencies.










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