www.pudn.com > voicebox2.zip > LPCAA2RF.M

function rf=lpcaa2rf(aa) 
%LPCAA2RF LPC: Convert vocal tract areas to reflection coefficients RF=(AA) 
 
%      Copyright (C) Mike Brookes 1998 
% 
%      Last modified Tue May 12 15:58:43 1998 
% 
%   VOICEBOX home page: http://www.ee.ic.ac.uk/hp/staff/dmb/voicebox/voicebox.html 
% 
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[nf,p2]=size(aa); 
rf = (aa(:,2:p2)-aa(:,1:p2-1))./(aa(:,2:p2)+aa(:,1:p2-1));