LPCAR2PF Convert AR coefs to power spectrum PF=(RA,NP) The routine is faster if NP+1 is a power of 2 For RA(:,p+1) the default value of np is p and the output is PF(:,p+2)

- rfft RFFT Calculate the DFT of real data Y=(X,N,D)

0001 function pf=lpcra2pf(ra,np) 0002 %LPCAR2PF Convert AR coefs to power spectrum PF=(RA,NP) 0003 % The routine is faster if NP+1 is a power of 2 0004 % For RA(:,p+1) the default value of np is p and the output is PF(:,p+2) 0005 0006 0007 % Copyright (C) Mike Brookes 1997 0008 % Version: $Id: lpcra2pf.m 713 2011-10-16 14:45:43Z dmb $ 0009 % 0010 % VOICEBOX is a MATLAB toolbox for speech processing. 0011 % Home page: http://www.ee.ic.ac.uk/hp/staff/dmb/voicebox/voicebox.html 0012 % 0013 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 0014 % This program is free software; you can redistribute it and/or modify 0015 % it under the terms of the GNU General Public License as published by 0016 % the Free Software Foundation; either version 2 of the License, or 0017 % (at your option) any later version. 0018 % 0019 % This program is distributed in the hope that it will be useful, 0020 % but WITHOUT ANY WARRANTY; without even the implied warranty of 0021 % MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 0022 % GNU General Public License for more details. 0023 % 0024 % You can obtain a copy of the GNU General Public License from 0025 % http://www.gnu.org/copyleft/gpl.html or by writing to 0026 % Free Software Foundation, Inc.,675 Mass Ave, Cambridge, MA 02139, USA. 0027 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 0028 0029 [nf,p1]=size(ra); 0030 if nargin<2 np=p1-1; end 0031 pp=2*np+2; 0032 if pp>=2*p1 0033 pf=abs(rfft([ra zeros(nf,pp-2*p1+1) ra(:,p1:-1:2)].').').^(-1); 0034 else 0035 pf=abs(rfft([ra(:,1:np+2) ra(:,np+1:-1:2)].').').^(-1); 0036 end 0037

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