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I have amplitude modulated sound file signal and after demodulation using FFT I got fundamental frequency and its harmonics and of course noise.

How to remove that fundamental modulation frequency and its harmonics from spectrum using Matlab… any suggestion… m-file…?

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    $\begingroup$ Please clarify your question. What kind of AM signal is it (DSB-LC, etc)? How did you demodulate it? Why do you have noise? What do you mean by 'fundamental modulation frequency'? Why do you want to remove it? $\endgroup$ – MBaz Oct 18 '14 at 17:01
  • $\begingroup$ I found the solution, I will use notch multiply filter. $\endgroup$ – ToShare Dec 18 '14 at 21:27

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