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Homework Help: Sample rate

  1. Nov 13, 2007 #1
    1. The problem statement, all variables and given/known data

    Say I have a spike at some frequency from a Fourier transform (power spectrum) of a waveform that I'm sampling (sine wave at 10Hz in this case). If I decrease the sample rate what should happen to the appearance of the spike? What about increasing the sample rate? What about the appearance of the original waveform vs time

    3. The attempt at a solution

    I would have thought with a lower sample rate the sine wave would widen? Not sure about the FT plot.

    I have written down from the lab that the spike widens (from the FT plot) with higher sampling rate and thins out for lower simpling rate.

    Any ideas?
  2. jcsd
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