Friday, 22 April 2016

EXP 2: DISCRETE FOURIER TRANSFORM

Discrete Fourier Transform and Inverse Discrete Fourier Transform using C programming is performed . Two cases were taken. In the first case a signal of length 4 was considered and DFT and IDFT were found. Then the signal was appended with 4 zeros to make it a signal of length 8. Then its DFT and IDFT was found. It is seen as the length of the input signal was increased the quality of the output magnitude spectrum improved. This was because the frequency spacing reduces which increases the approximation error in the spectrum representation.
https://drive.google.com/open?id=0Bzfvoo_rjoa8dUlPU19aMmZja1U
https://drive.google.com/open?id=0Bzfvoo_rjoa8SWk0TjBXcnNhWlE
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2 comments:

  1. Pratik Keny25 April 2016 at 21:58

    Dft is periodic as due to the nature of twiddle factor

    ReplyDelete
  2. Mesi25 April 2016 at 22:40

    yes we use periodic signal for DFT

    ReplyDelete

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