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Signal Processing: Up and Down Sampling

  1. Oct 1, 2012 #1
    1. The problem statement, all variables and given/known data
    Does the upsampling and downsampling have any effect on the amplitude?

    consider the following X(e^jw)

    25iw5ea.jpg

    2. Relevant equations


    what will be the amplitude of the signals? do they remain 1 or are they to be divided/multiplied by L/M, L being upsampling factor and M being downsampling factor?

    Please Help.
     
  2. jcsd
  3. Oct 2, 2012 #2

    rude man

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    What is "up" & "down" sampling? Do you mean oversampling and undersampling? With relation to Nyquist rate?
     
  4. Oct 2, 2012 #3
    up and down sampling means increasing or decreasing the sampling frequency!
     
  5. Oct 5, 2012 #4

    rude man

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    ƩIncreasing or decreasing the sampling frequency for a given input signal x(t) does not change the amplitude opf the samples.

    x(t) after sampling is Ʃx(nT)δ(t - nT) so x(nT) is the only thing that determines amplitude.
     
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