Digital FIR Filter Design using Frequency Sampling Method
Frequency Sampling Method (FSM) is another way of designing linear phase FIR filter.We have used SCILAB software for practical implementation. The formula of DFT and IDFT were put in code.Also filter parameters were taken as input from the user.The plot function enables the user to verify the accurateness of the designed filter.
Easiest method of FIR filter design.
ReplyDeleteThis method is easier than windowing method as many values become zero
ReplyDeleteDft and fft are good transforms
ReplyDeleteFSM method is an efficient method.
ReplyDeleteDiscontinuity is observed in phase plot between lobes and also when the phase spectrum goes out of the range of -pi to pi.
ReplyDeleteRectangular window is not preferred because value of As is 21dB
ReplyDeleteProper choice of sampling frequency is an important factor in designing filter
ReplyDeleteThe choice of window depends on the stop band attenuation requirement as in selected window's stop band attenuation should be slightly greater than the required value
ReplyDeletealising may occur if nyquist criterion is not followed
ReplyDelete