📄 ddiff_m.htm
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<BODY><PRE>% ddiff.m - ideal lowpass differentiator FIR filter
%
% h = ddiff(wc, N) = row vector
%
% N = 2M+1 = filter length (odd)
% wc in rads/sample
function h = ddiff(wc, N)
M = (N-1)/2;
for k = -M:M,
if k == 0,
h(k+M+1) = 0;
else
h(k+M+1) = wc * cos(wc * k) / (pi * k) - sin(wc * k) / (pi * k^2);
end
end
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