Digital Drive

• What's the FT of the input minus the output? - dave789 06:26:21 03/13/12 (1)
  In Reply to: RE: If It's of Amplitude Value other than 0.0dB.......... posted by Todd Krieger on March 12, 2012 at 22:24:21

  I see.

  I am still curious what the Fourier transform (the theoretical FT)
  of the difference,

  (

  (the input, 1/44100 second length square pulse)

  -

  (the output of it by a typical DAC such as Benchmark DAC 1 in Fig. 1 in the Stereophile web page I linked before)

  ),

  is.

  How much content does the difference have below 20kHz?
  

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  Edits: 03/13/12

  • RE: What's the FT of the input minus the output? - Todd Krieger 00:41:10 03/14/12 (0)
    In Reply to: RE: What's the FT of the input minus the output? posted by dave789 on March 13, 2012 at 06:26:21

    Not sure what you're getting at......... The FT of a single unfiltered short-duration square "pulse" in the time domain is a stretched-out "sinc function" in the frequency domain....... But in this application, not particularly useful.

    The output of a single pulse is typically the pulse convolved with a windowed "sinc function" over the time domain......... (This has nothing to do with the "sinc function" mentioned above.) The FT of that is the frequency response of the DAC, which is brickwall under this circumstance.
    
    
    

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    Edits: 03/14/12

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