Mercurial > hg > camir-aes2014

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

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
first hg version after svn
author wolffd
date Tue, 10 Feb 2015 15:05:51 +0000
parents
children
line wrap: on
line source
% 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 ];