Friday, 22 April 2016

FIR filter design using frequency sampling method

The objective of this experiment was to design a digital filter for the given input specifications using frequency sampling method. In this method the desired frequency response Hd(w) is sampled at w=2*pi*k/N ( where N = length of  the signal) The frequency samples are thus obtained are taken as DFT coefficients H[k]. FIR filter response is found by taken IDFT of H[k]. Manitude and phase spectrum were plotted for this. Pass band and stop band attenuation values were verified. 

https://drive.google.com/open?id=0B8Ks3rz0S_nzVE1ZRlItVFl4Qlk
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4 comments:

  1. Tejashree Gore25 April 2016 at 09:41

    Since the phase is linear, no distortion is observed in output signal.

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  2. Mesi25 April 2016 at 10:39

    poles lie inside the unit circle?

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  3. Unknown25 April 2016 at 22:36

    The phase plot is linear and similar for both LPF and HPF if order of the two filters is same. Since phase is linear, output is not distorted.

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  4. Unknown26 April 2016 at 08:40

    or the same values of attenuation in stop band and pass band, pass band and stop band frequencies and sampling frequencies we observe that the order of the FIR filter is much higher compared to that of the IIR filter.

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