We performed design of Linear Phase FIR Filter using Frequency Sampling Method. We took two case: Low Pass FIR Filter and High Pass FIR Filter using Scilab. We specified the stop band and pass band attenuation, stop band and pass band frequencies and sampling frequency in each case. We studied the magnitude and phase spectrum for each case. Phase response for both LPF and HPF remains same as long as the order is kept same in both cases.
FSM : https://drive.google.com/open?id=0BwzFGc0wvjNvbng1WWJIWlYwNkU
FSM : https://drive.google.com/open?id=0BwzFGc0wvjNvbng1WWJIWlYwNkU
Phase spectrum is linear within the positive lobes of magnitude spectrum.
ReplyDeleteWherever the lowest peak was observed in magnitude response, corresponding zero crossing was observed in phase response.
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ReplyDeleteA factor of 2*pi has to be added evertime there is a change of sign in the magnitude response.
ReplyDeleteA factor of m*pi has to be added. And when phase exceeds pi or - pi then 2*pi has to be added.
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