V_LPCLA2RF Convert log areas to reflection coefficients RF=(LA)
0001 function rf=v_lpcla2rf(la) 0002 %V_LPCLA2RF Convert log areas to reflection coefficients RF=(LA) 0003 0004 0005 % Copyright (C) Mike Brookes 1997 0006 % Version: $Id: v_lpcla2rf.m 10865 2018-09-21 17:22:45Z dmb $ 0007 % 0008 % VOICEBOX is a MATLAB toolbox for speech processing. 0009 % Home page: http://www.ee.ic.ac.uk/hp/staff/dmb/voicebox/voicebox.html 0010 % 0011 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 0012 % This program is free software; you can redistribute it and/or modify 0013 % it under the terms of the GNU General Public License as published by 0014 % the Free Software Foundation; either version 2 of the License, or 0015 % (at your option) any later version. 0016 % 0017 % This program is distributed in the hope that it will be useful, 0018 % but WITHOUT ANY WARRANTY; without even the implied warranty of 0019 % MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 0020 % GNU General Public License for more details. 0021 % 0022 % You can obtain a copy of the GNU General Public License from 0023 % http://www.gnu.org/copyleft/gpl.html or by writing to 0024 % Free Software Foundation, Inc.,675 Mass Ave, Cambridge, MA 02139, USA. 0025 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 0026 0027 [nf,p2]=size(la); 0028 rf=-tanh((la(:,1:p2-1)-la(:,2:p2))/2); 0029