Saturday, January 13, 2018

frequency spectrum - Discreteness and periodicity in Fourier transform


Why discreteness in time / frequency domain dictates periodicity in the other frequency / time domian?



  • For example the DTFT is perodic in frequency?


  • Why it doesn't contain all the frequencies?

  • Why the DTFS contain only finite number of frequencies?


NOTE:


I've read the derivation but sometimes i see it's like a definition or a claim in the case of DTFS.



  • How we prove that equation of DTFS ? x[n]=N1k=0akejlωon




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