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lpcar2rf

PURPOSE ^

LPCAR2RF Convert autoregressive coefficients to reflection coefficients AR=(RF)

SYNOPSIS ^

function rf=lpcar2rf(ar)

DESCRIPTION ^

LPCAR2RF Convert autoregressive coefficients to reflection coefficients AR=(RF)

 Input:   ar(:,p+1)  Autoregressive coefficients
 Output:  rf(:,p+1)  Reflection coefficients with rf(:,1)=1

CROSS-REFERENCE INFORMATION ^

This function calls: This function is called by:

SOURCE CODE ^

0001 function rf=lpcar2rf(ar)
0002 %LPCAR2RF Convert autoregressive coefficients to reflection coefficients AR=(RF)
0003 %
0004 % Input:   ar(:,p+1)  Autoregressive coefficients
0005 % Output:  rf(:,p+1)  Reflection coefficients with rf(:,1)=1
0006 
0007 
0008 %      Copyright (C) Mike Brookes 1997
0009 %      Version: $Id: lpcar2rf.m 8211 2016-07-20 20:59:16Z 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(ar);
0031 if p1==1
0032    rf=ones(nf,1);
0033 else
0034    if any(ar(:,1)~=1)
0035       ar=ar./ar(:,ones(1,p1));
0036    end
0037    rf = ar;
0038    for j = p1-1:-1:2
0039       k = rf(:,j+1);
0040       d = (1-k.^2).^(-1);
0041       wj=ones(1,j-1);
0042       rf(:,2:j) = (rf(:,2:j)-k(:,wj).*rf(:,j:-1:2)).*d(:,wj);
0043    end
0044 end
0045

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