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EXP 8 - FIR Filter Design using FSM(Frequency Sampling Method)

After designing an FIR Filter using Window function our next task was to design an FIR filter using Frequency Sampling Method(FSM).

The filter was designed by coding in C language in Scilab. The code was executed and the values of Pass and Stop band attenuation were verified using the graph which was obtained.

Comments

  1. FSM and Windowing methods seem to be totally different algorithms after calculation of transfer function in frequency domain.

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  2. In FSM technique we perform the sampling of the frequency response of the filter and this technique is considered to be one of the simplest methods for FIR filter design

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  3. FSM method is computationally more effecient as compared to that of windowing method

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  4. Discontinuity is observed in phase plot between lobes and also when the phase spectrum goes out of the range of -pi to pi.

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  5. Unlike the window method, FSM technique can be used for any given magnitude response.

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  6. The formula for value of N was found out using the value of c and the two frequencies of cutoff namely f2 and f1

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