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matlab code to produce equalizer low pass cut
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Matlab code to produce EQUALIZER LOW PASS CUT

wc=0.25*pi;

k=0.2;

alphab=(1-tan(wc/2))/(1+tan(wc/2));

b0=(k-k*alphab+1+alphab);

b1=(-k*alphab+k+alphab-1);

a1=alphab;

gb=[b0 b1];

ga=[2 -2*a1];

y1eq=filter(gb,ga,y1);

y2eq=filter(gb,ga,y2);

y3eq=filter(gb,ga,y3);

y4eq=filter(gb,ga,y4);

y5eq=filter(gb,ga,y5);

y6eq=filter(gb,ga,y6);

y7eq=filter(gb,ga,y7);

y8eq=filter(gb,ga,y8);

yeq=[y1eq' y2eq' y3eq' y4eq' y5eq' y6eq' y7eq' y8eq'];

sound(yeq,fs)