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lpcls2ar

PURPOSE ^

LPCLS2AR convert line spectrum pair frequencies to ar polynomial AR=(LS)

SYNOPSIS ^

function ar=lpcls2ar(ls)

DESCRIPTION ^

LPCLS2AR convert line spectrum pair frequencies to ar polynomial AR=(LS)
 input vector elements should be in the range 0 to 0.5

CROSS-REFERENCE INFORMATION ^

This function calls: This function is called by:

SOURCE CODE ^

0001 function ar=lpcls2ar(ls)
0002 %LPCLS2AR convert line spectrum pair frequencies to ar polynomial AR=(LS)
0003 % input vector elements should be in the range 0 to 0.5
0004 
0005 
0006 %      Copyright (C) Mike Brookes 1997
0007 %      Version: $Id: lpcls2ar.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 [nf,p]=size(ls);
0029 p1=p+1;
0030 p2 = p1*2;
0031 ar=zeros(nf,p1);
0032 for k=1:nf
0033   le=exp(ls(k,:)*pi*2i);
0034   lf=[1 le -1 conj(fliplr(le))];
0035   y=real(poly(lf(1:2:p2)));
0036   x=real(poly(lf(2:2:p2)));
0037   ar(k,:)=(x(1:p1)+y(1:p1))/2;
0038 end

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