?? notch.m
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%2瞞 IIR notch filter 拌薦 備竅扁
%[bi,ai]=notch(band,notch_frequency,sampling)
function[bi,ai]=notch(band,notch_frequency,sampling)
fs=sampling; % sampling freq.
fo=notch_frequency/(fs/2); % notch center freq.
df=band; % notch bandwidth
r=1-(pi/2)*(df/(fs/2));
bi=[ 1, -2*cos(fo*pi), 1];
ai=[ 1, -2*r*cos(fo*pi), r^2 ];
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