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Need help for Magnitude squared and filter co-efficeints

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moonnightingale

moonnightingale

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The pic is attached

Kindly tellme why book has used magnitude squared..

The second figure is obtained by this matlab code

h770=[];
L=10;
fs=8000;
fb=770;
h770 = (2/L)*cos(2*pi*fb*(0:L-1)/fs);
subplot(2,1,1)
stem(h770) % Plotting with L=10
title('Bandpass Filter for L=10 for h770')

L=100;
h770 = (2/L)*cos(2*pi*fb*(0:L-1)/fs);
subplot(2,1,2)
stem(h770) % Plotting with L=100
title('Bandpass Filter for L=100 for h770')

Kindly tell me
What is each group
Are these co-efficients from fourier series


Thanks a lot
 

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