?? lpcls2ar.m
字號:
function ar=lpcls2ar(ls)
%LPCLS2AR convert line spectrum pair frequencies to ar polynomial AR=(LS)
% input vector elements should be in the range 0 to 0.5
% Copyright (C) Mike Brookes 1997
% Version: $Id: lpcls2ar.m,v 1.3 2005/02/21 15:22:13 dmb Exp $
%
% VOICEBOX is a MATLAB toolbox for speech processing.
% Home page: http://www.ee.ic.ac.uk/hp/staff/dmb/voicebox/voicebox.html
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% This program is free software; you can redistribute it and/or modify
% it under the terms of the GNU General Public License as published by
% the Free Software Foundation; either version 2 of the License, or
% (at your option) any later version.
%
% This program is distributed in the hope that it will be useful,
% but WITHOUT ANY WARRANTY; without even the implied warranty of
% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
% GNU General Public License for more details.
%
% You can obtain a copy of the GNU General Public License from
% ftp://prep.ai.mit.edu/pub/gnu/COPYING-2.0 or by writing to
% Free Software Foundation, Inc.,675 Mass Ave, Cambridge, MA 02139, USA.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
[nf,p]=size(ls);
p1=p+1;
p2 = p1*2;
ar=zeros(nf,p1);
for k=1:nf
le=exp(ls(k,:)*pi*2i);
lf=[1 le -1 conj(fliplr(le))];
y=real(poly(lf(1:2:p2)));
x=real(poly(lf(2:2:p2)));
ar(k,:)=(x(1:p1)+y(1:p1))/2;
end
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