Design FIR filter using cot off frequency

Design a low pass digital FIR filter using Hamming window with length of the filter, N = 9 and a cut off frequency of 1.2 rad/sec. Further plot the magnitude and phase response of the designed filter

Answer 1

[BOGIREDDY SIVAPRASADREDDY]

Clc;

Clear all;

Close all;

N=9; %number of samples

wc=1.2; %cut of frequncy wc=(2*fc/fs); f=corner freq., fs=sampling freq.

b=fir1(N,wc/pi,hamming(N+1));

w=0:0.01:1.2*pi;

h=freqz(b,1,w);

subplot(211);

plot(w/pi,20*log(abs(h)));

title('Magnitude response(dB)');

xlabel('Frequency(*pi rad/sample)');

ylabel('magnitude in dB');

subplot(212);

plot(w/pi,phase(h));

title('Phase response');

xlabel('Frequency(*pi rad/sec)');

ylabel('Phase in radians');