Re: fourier anlysis of square wave...

Jerry Avins <jya@xxxxxxxx> wrote in
news:TYednZYNrtiqZNPanZ2dnUVZ_s_inZ2d@xxxxxxx:

The non-harmonic tones are aliases. Do you understand about aliasing in
sampled signals?

I would think that the signal is already sampled, so they're not aliases.
The FFT of a square wave is a sinc (sin(x pi)/(x pi) in the freq domain,
and has many frequency components that are not at harmonics of the sine.

This is true for sampled signals and purely digital signals that have never
seen a glimmer of our analog world.


--
Scott
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Relevant Pages

  • Re: fourier anlysis of square wave...
    ... The FFT of a square wave is a sinc /in the freq domain, and has many frequency components that are not at harmonics of the sine. ... This is true for sampled signals and purely digital signals that have never seen a glimmer of our analog world. ... When this continuous wave is sampled, those frequency components higher than Fs/2 become the aliases I wrote of. ...
    (comp.dsp)
  • Re: fourier anlysis of square wave...
    ... aliases. ... signal, you introduce harmonics that can go past the Nyquist frequency, ...
    (comp.dsp)
  • Re: fourier anlysis of square wave...
    ... Scott Seidman writes: ... sampled signals? ... aliases. ...
    (comp.dsp)