In this experiment we used a particular windowing function based upon the attenuation in stop band.There are different types of windowing functions Rectangular ,Bartlett ,Hamming ,Hanning, and Blackman.The specifications of As,Ap, stop band frequency, passband frequency and sampling frequency are taken from the user.It is observed that as the order of the filter increases the number of lobes in frequency response increase.The attenuation depends upon the type of window used.
Link:- Window function
Link:- Window function
Phase spectrum in lowpass and Bandpass filter is linear for linear phase FIR filter.
ReplyDeleteThanks for the addition Nikhil
DeleteAs Phase is directly proportional to the frequency i.e.,
Delete(Phi)-> Directly proportional to Omega(w) it has a linear response
Apt description!
ReplyDeleteThanks!
DeleteThe selection criteria of Window functions mainly depends upon the value of attenuation in stop band i.e., 'As'
ReplyDeleteYes and that is why we don't prefer using rectangular window function.
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ReplyDeleteYes it is always distorted since that phase is not directly proportional to frequency.
DeleteCompared with a Chebyshev Type I/Type II filter, the Butterworth filter has a slower roll-off, and thus will require a higher order to implement a particular stopband specification, but Butterworth filters have a more linear phase response in the pass-band than Chebyshev Type I/Type II filters can achieve.
ReplyDeleteA window function is required to truncate infinite samples of hd(n).
ReplyDeleteA window function is required to truncate infinite samples of hd(n).
ReplyDelete