V_LPCRF2LO Convert reflection coefficients to log area ratios LO=(RF) the output values are limited to about +-14.5
0001 function lo=v_lpcrf2lo(rf) 0002 %V_LPCRF2LO Convert reflection coefficients to log area ratios LO=(RF) 0003 %the output values are limited to about +-14.5 0004 0005 0006 % Copyright (C) Mike Brookes 1997 0007 % Version: $Id: v_lpcrf2lo.m 10865 2018-09-21 17:22:45Z dmb $ 0008 % 0009 % VOICEBOX is a MATLAB toolbox for speech processing. 0010 % Home page: http://www.ee.ic.ac.uk/hp/staff/dmb/voicebox/voicebox.html 0011 % 0012 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 0013 % This program is free software; you can redistribute it and/or modify 0014 % it under the terms of the GNU General Public License as published by 0015 % the Free Software Foundation; either version 2 of the License, or 0016 % (at your option) any later version. 0017 % 0018 % This program is distributed in the hope that it will be useful, 0019 % but WITHOUT ANY WARRANTY; without even the implied warranty of 0020 % MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 0021 % GNU General Public License for more details. 0022 % 0023 % You can obtain a copy of the GNU General Public License from 0024 % http://www.gnu.org/copyleft/gpl.html or by writing to 0025 % Free Software Foundation, Inc.,675 Mass Ave, Cambridge, MA 02139, USA. 0026 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 0027 0028 r=max(min(rf,1-1E-6),1E-6-1); 0029 lo=log((1-r)./(1+r)); 0030