moonnightingale
Full Member level 6
I have written this code for two filter lengths (L)
h770=[];
L=10;
fs=8000;
fb=770;
h770 = (2/L)*cos(2*pi*fb*(0:L-1)/fs);
ww=0
ff=ww/(2*pi)*fs;
H=freqz(h770,1,ww);
subplot(2,1,1)
plot(ff,abs(H));
title('Magnitude response for L=10 for h770')
grid on;
L=100;
h770 = (2/L)*cos(2*pi*fb*(0:L-1)/fs);
H=freqz(h770,1,ww);
subplot(2,1,2)
plot(ff,abs(H));
title('Magnitude response for L=100 for h770')
grid on;
Now the book asks, Notice the selectivity of filters based on filter length. Think about how this selectivity is used to pass one component while rejecting or attenuating the others.
Kindly explain this to me what he mean by selectivity.
h770=[];
L=10;
fs=8000;
fb=770;
h770 = (2/L)*cos(2*pi*fb*(0:L-1)/fs);
ww=0
ff=ww/(2*pi)*fs;
H=freqz(h770,1,ww);
subplot(2,1,1)
plot(ff,abs(H));
title('Magnitude response for L=10 for h770')
grid on;
L=100;
h770 = (2/L)*cos(2*pi*fb*(0:L-1)/fs);
H=freqz(h770,1,ww);
subplot(2,1,2)
plot(ff,abs(H));
title('Magnitude response for L=100 for h770')
grid on;
Now the book asks, Notice the selectivity of filters based on filter length. Think about how this selectivity is used to pass one component while rejecting or attenuating the others.
Kindly explain this to me what he mean by selectivity.