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lpcrr2ar

PURPOSE ^

LPCRR2AR convert autocorrelation coefs to ar coefs [AR,E]=(RR)

SYNOPSIS ^

function [ar,e]=lpcrr2ar(rr);

DESCRIPTION ^

LPCRR2AR convert autocorrelation coefs to ar coefs [AR,E]=(RR)
E is the residual energy

CROSS-REFERENCE INFORMATION ^

This function calls: This function is called by:

SOURCE CODE ^

0001 function [ar,e]=lpcrr2ar(rr);
0002 %LPCRR2AR convert autocorrelation coefs to ar coefs [AR,E]=(RR)
0003 %E is the residual energy
0004 
0005 % could test e each time and remove rows when it gets small
0006 
0007 
0008 %      Copyright (C) Mike Brookes 1997
0009 %      Version: $Id: lpcrr2ar.m 713 2011-10-16 14:45:43Z dmb $
0010 %
0011 %   VOICEBOX is a MATLAB toolbox for speech processing.
0012 %   Home page: http://www.ee.ic.ac.uk/hp/staff/dmb/voicebox/voicebox.html
0013 %
0014 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
0015 %   This program is free software; you can redistribute it and/or modify
0016 %   it under the terms of the GNU General Public License as published by
0017 %   the Free Software Foundation; either version 2 of the License, or
0018 %   (at your option) any later version.
0019 %
0020 %   This program is distributed in the hope that it will be useful,
0021 %   but WITHOUT ANY WARRANTY; without even the implied warranty of
0022 %   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
0023 %   GNU General Public License for more details.
0024 %
0025 %   You can obtain a copy of the GNU General Public License from
0026 %   http://www.gnu.org/copyleft/gpl.html or by writing to
0027 %   Free Software Foundation, Inc.,675 Mass Ave, Cambridge, MA 02139, USA.
0028 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
0029 
0030 [nf,p1]=size(rr);
0031 p=p1-1;
0032 ar=ones(nf,p1);
0033 ar(:,2) = -rr(:,2)./rr(:,1);
0034 e = rr(:,1).*(ar(:,2).^2-1);
0035 for n = 2:p
0036    k = (rr(:,n+1)+sum(rr(:,n:-1:2).*ar(:,2:n),2)) ./ e;
0037    ar(:,2:n) = ar(:,2:n)+k(:,ones(1,n-1)).*ar(:,n:-1:2);
0038    ar(:,n+1) = k;
0039    e = e.*(1-k.^2);
0040 end
0041 e=-e;

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