V_LPCAA2DL LPC: Convert area coefficients to dct of log area DL=(AA)
0001 function dl=v_lpcaa2dl(aa) 0002 %V_LPCAA2DL LPC: Convert area coefficients to dct of log area DL=(AA) 0003 0004 % note: we do not correct for sinc distortion; perhaps we should multiply by 0005 % k=1:p-1;s=[sqrt(0.5)/p 2*sin(pi*k/(2*p))./(pi*k)]; 0006 0007 0008 0009 % Copyright (C) Mike Brookes 1998 0010 % Version: $Id: v_lpcaa2dl.m 10865 2018-09-21 17:22:45Z dmb $ 0011 % 0012 % VOICEBOX is a MATLAB toolbox for speech processing. 0013 % Home page: http://www.ee.ic.ac.uk/hp/staff/dmb/voicebox/voicebox.html 0014 % 0015 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 0016 % This program is free software; you can redistribute it and/or modify 0017 % it under the terms of the GNU General Public License as published by 0018 % the Free Software Foundation; either version 2 of the License, or 0019 % (at your option) any later version. 0020 % 0021 % This program is distributed in the hope that it will be useful, 0022 % but WITHOUT ANY WARRANTY; without even the implied warranty of 0023 % MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 0024 % GNU General Public License for more details. 0025 % 0026 % You can obtain a copy of the GNU General Public License from 0027 % http://www.gnu.org/copyleft/gpl.html or by writing to 0028 % Free Software Foundation, Inc.,675 Mass Ave, Cambridge, MA 02139, USA. 0029 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 0030 0031 [nf,p2]=size(aa); 0032 dl=v_rdct(log(aa(:,2:p2-1)./aa(:,p2*ones(1,p2-2))).').'; 0033 0034