gusucode.com > 语音信号处理工具箱 - Voicebox源码程序 > Voicebox\lpcbwexp.m
function arx=lpcbwexp(ar,bw) %LPCBWEXP expand formant bandwidths of LPC filter ARX=(AR,BW) %minimum bandwidth will be BW*fs where fs is the sampling frequency %the radius of each pole will be multiplied by R=exp(-BW*pi) % To set the maximum pole radius to R use BW=-log(R)/PI. % Copyright (C) Mike Brookes 1998 % % Last modified Sun Jan 2 20:12:38 2000 % % VOICEBOX is a MATLAB toolbox for speech processing. Home page is at % 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,p1]=size(ar); k=exp(-pi*(0:p1-1)*bw); arx=ar.*k(ones(nf,1),:);