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If I had a signal that contained, say, a square wave and a sawtooth wave, how would I extract the frequency of the sawtooth wave without the higher harmonics that make the Fourier series converge on the sawtooth? I am writing a program that ideally would show the frequency of each signal in a song, but my problem is that the harmonics are showing up as well, which kind of gets in the way of the (fundamental?) frequency that I really want.

Esssentially, if I had a horn and a synthesizer playing single but separate notes, I want the frequency of those notes but not the higher harmonics that help you converge on the actual signal of each of those notes.

ben
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  • Apply a band width filter? This will limit the higher frequencies. – Chinny84 Jun 02 '15 at 18:02
  • But what if a fundamental frequency is high? Then I'd be missing out on all those higher fundamental frequencies. – ben Jun 02 '15 at 18:53

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