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annotate toolboxes/MIRtoolbox1.3.2/AuditoryToolbox/SecondOrderFilter.m @ 0:e9a9cd732c1e tip

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first hg version after svn
author wolffd
date Tue, 10 Feb 2015 15:05:51 +0000
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wolffd@0 1 % filter = SecondOrderFilter(f, q, fs)
wolffd@0 2 % Design a second order digital filter with a center frequency of
wolffd@0 3 % f, filter quality of q, and digital sampling rate of fs (Hz).
wolffd@0 4
wolffd@0 5 % (c) 1998 Interval Research Corporation
wolffd@0 6
wolffd@0 7 function filts = SecondOrderFilter(f,q,fs)
wolffd@0 8 cft = f'/fs;
wolffd@0 9 rho = exp(- pi * cft ./ q');
wolffd@0 10 theta = 2 * pi * cft .* sqrt(1-1 ./(4*q'.^2));
wolffd@0 11 filts = [ ones(size(rho)) -2*rho.*cos(theta) rho.^2 ];