gusucode.com > 《MATLAB图像与视频处理实用案例详解》代码 > 《MATLAB图像与视频处理实用案例详解》代码/第 19 章 基于语音识别的信号灯图像模拟控制技术/voicebox/lpcconv.m
function s=lpcconv(from,to,x,y,np) %LPCCONV(from,to,x,y)->s convert between LPC parameter sets % % The output is a string that may be passed to eval(s) % x and y are optionally the input and output matrices % and np the new value of the order p. % with one frame stored per row. from and to are taken % from the following list which also gives the column dimension: % % 1 ar p+1 Autoregressive coevfficients: ar(1)=1 always. % 2 cc p Complex cepstral coefficients % 3 ls p Line spectrum pair frequencies (normalized Hz) % 4 zz p Z-plane roots % 5 ss p S-plane roots (normalized Hz) % 6 rf p Reflection coefficients (= -PARCOR coefs) % 7 ao p Area ratios % 8 aa p+2 Vocal tract areas: aa(p+2)=1 always % 9 rr p+1 Autocorrelation coefficients % 10 dl p DCT of log area function % 11 lo p Log area ratios % 12 la p+1 Log areas: la(1)=0 always % 13 ra p+1 Autocorrelation coefs of inverse filter % 14 ff p+2 Fourier transform of forward filter (all-pole) % 15 pf p+2 Power spectrum of forward filter (all-pole) % 16 gc p Gain and cos(w) of each formant % 17 im p+1 Impulse response of forward filter % Copyright (C) Mike Brookes 1998 % Version: $Id: lpcconv.m,v 1.4 2007/05/04 07:01:38 dmb Exp $ % % VOICEBOX is a MATLAB toolbox for speech processing. % 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 % http://www.gnu.org/copyleft/gpl.html or by writing to % Free Software Foundation, Inc.,675 Mass Ave, Cambridge, MA 02139, USA. %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% nm=['aa';'am';'ao';'ar';'cc';'db';'dl';'ff';'fq';'im';'is';'la';'lo';'ls';'pf';'ra';'rf';'rr';'ss';'zz';]; nx=[... 0 17 3 17 17 17 7 17 0 17 17 17 17 17 17 17 17 17 17 17;... 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0;... 17 17 0 17 17 17 17 17 0 17 17 17 17 17 17 17 17 17 17 17;... 17 18 17 0 5 6 17 8 0 10 17 17 17 14 15 16 17 18 20 20;... 4 4 4 4 5 6 4 4 0 4 4 4 4 4 15 4 4 4 4 4;... 15 15 15 15 15 0 15 15 0 15 15 15 15 15 15 15 15 15 15 15;... 1 1 1 1 1 1 0 1 0 1 1 1 1 1 1 1 1 1 1 1;... 15 15 15 15 15 15 15 0 0 15 15 15 15 15 15 15 15 15 15 15;... 20 20 20 20 20 20 20 20 0 20 20 20 20 20 20 20 20 20 20 20;... 4 4 4 4 4 4 4 4 0 0 4 4 4 4 4 4 4 4 4 4;... 17 17 17 17 17 17 17 17 0 17 0 17 17 17 17 17 17 17 17 17;... 17 17 17 17 17 17 17 17 0 17 17 0 17 17 17 17 17 17 17 17;... 17 17 17 17 17 17 17 17 0 17 17 17 0 17 17 17 17 17 17 17;... 4 4 4 4 4 4 4 4 0 4 4 4 4 0 4 4 4 4 4 4;... 5 18 5 5 5 5 5 5 0 5 5 5 5 5 0 5 5 18 5 5;... 15 15 15 15 15 15 15 15 0 15 15 15 15 15 15 0 15 15 15 15;... 1 18 3 4 4 4 1 4 0 4 11 12 13 4 4 4 0 18 4 4;... 4 2 4 4 4 4 4 4 0 4 4 4 4 4 4 4 4 0 4 4;... 20 20 20 20 20 20 20 20 0 20 20 20 20 20 20 20 20 20 0 20;... 4 4 4 4 5 4 4 4 0 4 4 4 4 4 4 4 4 4 19 0;... ]; na=size(nm,1); b=256*nm(:,1)+nm(:,2); jf=find(b==256*from(1)+from(2)); jt=find(b==256*to(1)+to(2)); if length([jf jt])~=2 [x,idx]=sort(b); error(sprintf('lpcxx2yy types are: %s',[nm(idx,:)';' '*ones(1,na)])); end if nargin<3 s=nm(jf,:); else s=x; end while jf ~= jt jn=nx(jf,jt); if jn==0 error(sprintf('cannot convert between %s and %s',nm(jf,:),nm(jt,:))); end s=sprintf('lpc%s2%s(%s)',nm(jf,:),nm(jn,:),s); jf=jn; end if nargin<4 sn=nm(jt,:); else sn=y; end s=sprintf('%s=%s;',sn,s);