function ff=lpcar2ff(ar,np)
%LPCAR2FF LPC: Convert AR coefs to complex spectrum FF=(AR,NP)



%      Copyright (C) Mike Brookes 1998
%
%      Last modified Tue May 12 15:59:20 1998
%
%   VOICEBOX 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
%   it under the terms of the GNU General Public License as published by
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%   This program is distributed in the hope that it will be useful,
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[nf,p1]=size(ar);
if nargin<2 np=p1-1; end
ff=(rfft(ar.',2*np+2).').^(-1);