Suppose we want to design a lowpass filter: wp=0.3 pi; ws=0.5 pi; delta 1 = 0.00

Question

Suppose we want to design a lowpass filter: wp=0.3 pi; ws=0.5 pi; delta 1 = 0.001; Write down the two Matlab commands that can be used to obtain such a filter when the sampling frequency of the system is 4000Hz. The optimum FIR filter design method is called Park-McClellan method. Explain the meaning of the following Matlab command, and design an optimum FIR filter with wp=0.3 pi; B = firm (N, F, A). Given the FIR filter function obtained in problem 9, and 10, what are their group delay respectively? Please plot the phase function using fv tools(A, B).

Explanation / Answer

Problem:9

d = fdesign.lowpass('Fp,Fst,N,FC',fpassband,fstopband,order_of_the_filter,fsampling);

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