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lpcar2rr

PURPOSE ^

LPCAR2RR Convert autoregressive coefficients to autocorrelation coefficients RR=(AR,P)

SYNOPSIS ^

function rr=lpcar2rr(ar,p)

DESCRIPTION ^

LPCAR2RR Convert autoregressive coefficients to autocorrelation coefficients RR=(AR,P)
 The routine calculated the autocorrelation coefficients of the signal
 that results from feeding unit-variance, zero-mean noise into the all-pole filter
 Input:   ar(:,n+1)  Autoregressive coefficients including 0'th coefficient
 Output:  rr(:,p+1)    Autocorrelation coefficients including 0'th order coefficient
 If p is not specified it is taken to be n

CROSS-REFERENCE INFORMATION ^

This function calls: This function is called by:

SOURCE CODE ^

0001 function rr=lpcar2rr(ar,p)
0002 %LPCAR2RR Convert autoregressive coefficients to autocorrelation coefficients RR=(AR,P)
0003 % The routine calculated the autocorrelation coefficients of the signal
0004 % that results from feeding unit-variance, zero-mean noise into the all-pole filter
0005 % Input:   ar(:,n+1)  Autoregressive coefficients including 0'th coefficient
0006 % Output:  rr(:,p+1)    Autocorrelation coefficients including 0'th order coefficient
0007 % If p is not specified it is taken to be n
0008 
0009 
0010 %      Copyright (C) Mike Brookes 1997
0011 %      Version: $Id: lpcar2rr.m 713 2011-10-16 14:45:43Z dmb $
0012 %
0013 %   VOICEBOX is a MATLAB toolbox for speech processing.
0014 %   Home page: http://www.ee.ic.ac.uk/hp/staff/dmb/voicebox/voicebox.html
0015 %
0016 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
0017 %   This program is free software; you can redistribute it and/or modify
0018 %   it under the terms of the GNU General Public License as published by
0019 %   the Free Software Foundation; either version 2 of the License, or
0020 %   (at your option) any later version.
0021 %
0022 %   This program is distributed in the hope that it will be useful,
0023 %   but WITHOUT ANY WARRANTY; without even the implied warranty of
0024 %   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
0025 %   GNU General Public License for more details.
0026 %
0027 %   You can obtain a copy of the GNU General Public License from
0028 %   http://www.gnu.org/copyleft/gpl.html or by writing to
0029 %   Free Software Foundation, Inc.,675 Mass Ave, Cambridge, MA 02139, USA.
0030 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
0031 
0032 k=ar(:,1).^(-2);
0033 if size(ar,2)==1
0034    rr=k;
0035 else
0036    if nargin>1
0037       rr=lpcrf2rr(lpcar2rf(ar),p).*k(:,ones(1,p+1));
0038    else
0039       rr=lpcrf2rr(lpcar2rf(ar)).*k(:,ones(1,size(ar,2)));
0040    end
0041 end

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