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Reverse FFT

  1. Aug 11, 2004 #1
    I am using matlab.
    I was wondering if anyone knew how to take the results from a spectrum analysis of a signal in x at sample frequency fs:
    y = abs(fft(x,fs));
    and turn it back into the signal x. My purpose is to modify the spectrum by removing certain frequencies found in the spectrum analysis and then turning it back into a signal to hear what it sounds like.

  2. jcsd
  3. Aug 11, 2004 #2

    Dr Transport

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    Science Advisor
    Gold Member

    apply the filter, then retransform.
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