function is=lpcrf2is(rf)
%LPCRF2IS Convert reflection coefficients to inverse sines IS=(RF)


%      Copyright (C) Mike Brookes 1997
%      Version: $Id: lpcrf2is.m,v 1.4 2007/05/04 07:01:39 dmb Exp $
%
%   VOICEBOX is a MATLAB toolbox for speech processing.
%   Home page: http://www.ee.ic.ac.uk/hp/staff/dmb/voicebox/voicebox.html
%
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%   This program is free software; you can redistribute it and/or modify
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%   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
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is=asin(rf)*2/pi;