?? dfirlpp.m
字號:
function [wp,ws,w0]=dfirlpp(ty,fp,fs,ff)
% FIRLPP
% Author: Ashok Ambardar <akambard@mtu.edu>
% Date: 2/2/96 11:32AM
% Copyright (c) 1997 by Prentice-Hall, Inc.
w0 = 0;
wp = fp/ff;
ws = fs/ff; % for lp
if ty == 2, % highpass
wp = pi-wp;
ws = pi-ws;
end
if ty == 3 | ty == 4,
ap = abs(diff(fp));
as = abs(diff(fs));
dw1 = abs(wp(1)-ws(1));
dw2 = abs(wp(2)-ws(2));
dw = min(dw1,dw2);
if ty == 3,
w0 = 0.5*(wp(1)+wp(2));
wp = 0.5*(wp(2)-wp(1));
else
w0 = 0.5*(ws(1)+ws(2));
wp = 0.5*(ws(2)-ws(1));
end
ws = wp+dw;
end
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