www.gusucode.com > 语音信号处理工具箱 - Voicebox源码程序 > Voicebox\lpcar2db.m

    function db=lpcar2db(ar,np)
%LPCAR2DB LPC: Convert AR coefs to power spectrum in dB DB=(AR)



%      Copyright (C) Mike Brookes 1998
%
%      Last modified Fri Apr  3 14:57:15 1998
%
%   VOICEBOX home page: http://www.ee.ic.ac.uk/hp/staff/dmb/voicebox/voicebox.html
%
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%   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.
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%   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.
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%   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.
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[nf,p1]=size(ar);
if nargin<2 np=p1-1; end
ff=rfft(ar.',2*np+2).';
db=-10*log10(real(ff.*conj(ff)));
if nargout==0
   plot((0:np+1)/(2*np+2),db.');
   ylabel('dB');
end