The digital filter is designed using frequency sampling method. For LPF and HPF filter Design we have taken Pass band Attenuation (Ap), Stop band Attenuation (As), Pass band Frequency (Fp) in Hz, Stop band Frequency (Fs) in Hz, Sampling Frequency in Hz as an input. I have plotted Magnitude Spectrum and Phase Spectrum and verified the value of Ap and As in pass band and stop band from the spectrum. From magnitude response it is clear that number of lobes increases with increase in order.
fir-fsm
fir-fsm
At times we prefer windowing over frequency sampling as it's in our hands to choose the window function according to our requirement. Though FSM is better as it gives more number of zero coefficients it makes computations easier.
ReplyDeleteWindow method is most widely used for filter design but frequency sampling method is also used
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