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lpcbwexp

PURPOSE ^

LPCBWEXP expand formant bandwidths of LPC filter ARX=(AR,BW)

SYNOPSIS ^

function arx=lpcbwexp(ar,bw)

DESCRIPTION ^

LPCBWEXP expand formant bandwidths of LPC filter ARX=(AR,BW)
minimum bandwidth will be BW*fs where fs is the sampling frequency
the radius of each pole will be multiplied by R=exp(-BW*pi)
 To set the maximum pole radius to R use BW=-log(R)/PI.

CROSS-REFERENCE INFORMATION ^

This function calls: This function is called by:

SOURCE CODE ^

0001 function arx=lpcbwexp(ar,bw)
0002 %LPCBWEXP expand formant bandwidths of LPC filter ARX=(AR,BW)
0003 %minimum bandwidth will be BW*fs where fs is the sampling frequency
0004 %the radius of each pole will be multiplied by R=exp(-BW*pi)
0005 % To set the maximum pole radius to R use BW=-log(R)/PI.
0006 
0007 
0008 
0009 %      Copyright (C) Mike Brookes 1998
0010 %      Version: $Id: lpcbwexp.m 713 2011-10-16 14:45:43Z dmb $
0011 %
0012 %   VOICEBOX is a MATLAB toolbox for speech processing.
0013 %   Home page: http://www.ee.ic.ac.uk/hp/staff/dmb/voicebox/voicebox.html
0014 %
0015 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
0016 %   This program is free software; you can redistribute it and/or modify
0017 %   it under the terms of the GNU General Public License as published by
0018 %   the Free Software Foundation; either version 2 of the License, or
0019 %   (at your option) any later version.
0020 %
0021 %   This program is distributed in the hope that it will be useful,
0022 %   but WITHOUT ANY WARRANTY; without even the implied warranty of
0023 %   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
0024 %   GNU General Public License for more details.
0025 %
0026 %   You can obtain a copy of the GNU General Public License from
0027 %   http://www.gnu.org/copyleft/gpl.html or by writing to
0028 %   Free Software Foundation, Inc.,675 Mass Ave, Cambridge, MA 02139, USA.
0029 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
0030 
0031 [nf,p1]=size(ar);
0032 k=exp(-pi*(0:p1-1)*bw);
0033 arx=ar.*k(ones(nf,1),:);

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