gusucode.com > 《MATLAB图像与视频处理实用案例详解》代码 > 《MATLAB图像与视频处理实用案例详解》代码/第 19 章 基于语音识别的信号灯图像模拟控制技术/voicebox/lpcls2ar.m
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 1.4 2007/05/04 07:01:38 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 % http://www.gnu.org/copyleft/gpl.html 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