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

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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