Mercurial > hg > camir-aes2014

diff 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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--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolboxes/MIRtoolbox1.3.2/AuditoryToolbox/SecondOrderFilter.m	Tue Feb 10 15:05:51 2015 +0000
@@ -0,0 +1,11 @@
+% filter = SecondOrderFilter(f, q, fs)
+% Design a second order digital filter with a center frequency of
+% f, filter quality of q, and digital sampling rate of fs (Hz).
+
+% (c) 1998 Interval Research Corporation  
+
+function filts = SecondOrderFilter(f,q,fs)
+cft = f'/fs;
+rho = exp(- pi * cft ./ q');
+theta = 2 * pi * cft .* sqrt(1-1 ./(4*q'.^2));
+filts = [ ones(size(rho)) -2*rho.*cos(theta) rho.^2 ];