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lpcrf2la

PURPOSE ^

LPCRF2LA Convert reflection coefficients to log areas LA=(RF)

SYNOPSIS ^

function la=lpcrf2la(rf)

DESCRIPTION ^

LPCRF2LA Convert reflection coefficients to log areas LA=(RF)
 areas are normalised to give la(p+2)=0, the log area of the free space beyond lips

CROSS-REFERENCE INFORMATION ^

This function calls: This function is called by:

SOURCE CODE ^

0001 function la=lpcrf2la(rf)
0002 %LPCRF2LA Convert reflection coefficients to log areas LA=(RF)
0003 % areas are normalised to give la(p+2)=0, the log area of the free space beyond lips
0004 
0005 
0006 %      Copyright (C) Mike Brookes 1997
0007 %      Version: $Id: lpcrf2la.m 713 2011-10-16 14:45:43Z dmb $
0008 %
0009 %   VOICEBOX is a MATLAB toolbox for speech processing.
0010 %   Home page: http://www.ee.ic.ac.uk/hp/staff/dmb/voicebox/voicebox.html
0011 %
0012 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
0013 %   This program is free software; you can redistribute it and/or modify
0014 %   it under the terms of the GNU General Public License as published by
0015 %   the Free Software Foundation; either version 2 of the License, or
0016 %   (at your option) any later version.
0017 %
0018 %   This program is distributed in the hope that it will be useful,
0019 %   but WITHOUT ANY WARRANTY; without even the implied warranty of
0020 %   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
0021 %   GNU General Public License for more details.
0022 %
0023 %   You can obtain a copy of the GNU General Public License from
0024 %   http://www.gnu.org/copyleft/gpl.html or by writing to
0025 %   Free Software Foundation, Inc.,675 Mass Ave, Cambridge, MA 02139, USA.
0026 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
0027 
0028 r=max(min(rf,1-1E-6),1E-6-1);
0029 lo=log((1-r)./(1+r));
0030 la=fliplr([zeros(size(rf,1),1) cumsum(fliplr(log((1-r)./(1+r))).').']);
0031

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