show how to get the answer. Design a notch filter to meet the following specific

Question

show how to get the answer.

Design a notch filter to meet the following specifications: The center frequency of the rejection band is at 60 Hz and the 3 dB rejection bandwidth is 10 Hz. The minimum loss for 59 Hz lessthanorequalto f lessthanorequalto 61 Hz is 40 dB The passband degradation is at most 0.1 dB for f Greaterthanorequalto 75 Hz and for f lessthanorequalto 20 Hz. Find the minimum order Butterworth bandpass filter to meet all the requirements. Find the transfer function of the desired filter.

Explanation / Answer

clear all;

close all;

x=input('enter the sequence');

subplot(3,1,1);

stem(x);

xlabel('time');

ylabel('magnitude');

title('input sequence');

N=length(x);

y=(zeros(1,N));

x=bitrevorder(x);

q=1;

for m=1:1:(log(N)/log(2))

for n=1:1:N/2^m

for p= 1:1:2^(m-1)

            a=x(q);

            b=x(q+2^(m-1));

            y(q)=a+b;

            y(q+2^(m-1))=(a-b)*exp(-i*2*pi*(p-1)/2^m);

            q=q+1;

end

       q=2*m*n+1;

end

    q=1;

for t=1:1:N

        x(t)=y(t);

end

end

y=bitrevorder(x);

subplot(3,1,2);

stem(abs(y));

xlabel('time');

ylabel('amplitude');

title('magnitude');

subplot(3,1,3);

stem(angle(y));

xlabel('angle');

ylabel('amplitude');

title('angle of DIF-FFT');

disp(y);

gtext('kluniversity')

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