gusucode.com > 语音信号处理工具箱 - Voicebox源码程序 > Voicebox\lpcaa2dl.m
function dl=lpcaa2dl(aa) %LPCAA2DL LPC: Convert area coefficients to dct of log area DL=(AA) % note: we do not correct for sinc distortion; perhaps we should multiply by % k=1:p-1;s=[sqrt(0.5)/p 2*sin(pi*k/(2*p))./(pi*k)]; % 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 % %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % 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,p2]=size(aa); dl=rdct(log(aa(:,2:p2-1)./aa(:,p2*ones(1,p2-2))).').';