Spectrum analysis of square wave

Discussion in 'Math' started by Chradem, Nov 13, 2009.

  1. Chradem

    Thread Starter New Member

    Nov 13, 2009
    2
    0
    I would like to have the frequency power spectrum of a square wave.

    The duration of one wave (T/2) is 0.1 ms. Only the positive part is used. However the amount of squares also varies from 1 to 30 Hz.

    So I would like to compare the spectral densities of 30 Hz and 1 Hz squarewaves, in which each square has a duration of 0.1 ms.

    Could anyone tell me how to do this.
     
  2. steinar96

    Active Member

    Apr 18, 2009
    239
    4
    If you have the data, you can take the DTFT (discrete time fourier transform) of it in matlab for example. And analyze the different waveforms you get.
     
    Last edited: Nov 13, 2009
  3. Thav

    Member

    Oct 13, 2009
    82
    0
    There are fourier transform pairs that will help you get the frequency spectrum. From there the spectral density is something related to the integral of the frequency spectrum in a certain band. Since the square wave is the sum of discrete frequencies, the spectral density can be rewritten as a sum instead of an integral.
     
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