gusucode.com > 语音信号处理工具箱 - Voicebox源码程序 > Voicebox\lpcrand.m
function ar=lpcrand(p,n,bw) % generate n random stable polynomials of order p with a minimum pole % bandwidth of bw*fs where fs is the sampling fequency. % To limit the pole radius to r set bw=-log(r)/pi % bw may be a vector specifying a different max bandwidth for each row % Copyright (C) Mike Brookes 1997 % % Last modified Wed Dec 29 16:12:18 1999 % % VOICEBOX is a MATLAB toolbox for speech processing. Home page is at % 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. %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% if nargin < 3 bw=0; if nargin < 2 n=1; end end if p if ~bw ar=lpcrf2ar(2*rand(n,p+1)-1); else k=exp(-pi*bw(:)*(0:p)); if size(k,1)==1 ar=lpcrf2ar(2*rand(n,p+1)-1).*k(ones(n,1),:); else ar=lpcrf2ar(2*rand(n,p+1)-1).*k; end end else ar=ones(n,1); end