DFT - zero padding avoids aliasing?

  • Thread starter LM741
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  • #1
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hey guys - i can't seem to find find this statement anywhere - but it makes sense to me - could someone please verify.
When you find the DFT of a signal say: x[0]=2, x[1]=4, x[2]=6, x[3]=8 - you will get four discrete points in frequency (per period) now if you zero pad the time signal such that you get x[0]=2, x[1]=4, x[2]=6, x[3]=8 x[4]=0, x[5]=0, x[6]=0, x[7]=0 - you will once agin get four discrete frequency points but now the gap between each period will be larger (thus decreasing any chances of aliasing)


thnks
 

Answers and Replies

  • #2
anorlunda
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Sure, but that is a completely different signal with a different DFT. It is an apples/oranges comparison.
 

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