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v_lpcrand

PURPOSE ^

V_LPCRAND generate random stable polynomials AR=(P,N,BW)

SYNOPSIS ^

function ar=v_lpcrand(p,n,bw)

DESCRIPTION ^

V_LPCRAND generate random stable polynomials AR=(P,N,BW)
 generate n random stable polynomials of order p with a minimum pole
 bandwidth of bw*fs where fs is the sampling fequency.
 To limit the pole radius to r set bw=-log(r)/pi
 bw may be a vector specifying a different max bandwidth for each row

CROSS-REFERENCE INFORMATION ^

This function calls: This function is called by:

SOURCE CODE ^

0001 function ar=v_lpcrand(p,n,bw)
0002 %V_LPCRAND generate random stable polynomials AR=(P,N,BW)
0003 % generate n random stable polynomials of order p with a minimum pole
0004 % bandwidth of bw*fs where fs is the sampling fequency.
0005 % To limit the pole radius to r set bw=-log(r)/pi
0006 % bw may be a vector specifying a different max bandwidth for each row
0007 
0008 %      Copyright (C) Mike Brookes 1997-2018
0009 %      Version: $Id: v_lpcrand.m 10865 2018-09-21 17:22:45Z dmb $
0010 %
0011 %   VOICEBOX is a MATLAB toolbox for speech processing.
0012 %   Home page: http://www.ee.ic.ac.uk/hp/staff/dmb/voicebox/voicebox.html
0013 %
0014 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
0015 %   This program is free software; you can redistribute it and/or modify
0016 %   it under the terms of the GNU General Public License as published by
0017 %   the Free Software Foundation; either version 2 of the License, or
0018 %   (at your option) any later version.
0019 %
0020 %   This program is distributed in the hope that it will be useful,
0021 %   but WITHOUT ANY WARRANTY; without even the implied warranty of
0022 %   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
0023 %   GNU General Public License for more details.
0024 %
0025 %   You can obtain a copy of the GNU General Public License from
0026 %   http://www.gnu.org/copyleft/gpl.html or by writing to
0027 %   Free Software Foundation, Inc.,675 Mass Ave, Cambridge, MA 02139, USA.
0028 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
0029 
0030 if nargin < 3
0031    bw=0;
0032    if nargin < 2
0033       n=1;
0034    end
0035 end 
0036 if p
0037    if ~bw
0038       ar=v_lpcrf2ar(2*rand(n,p+1)-1);
0039    else
0040       k=exp(-pi*bw(:)*(0:p));
0041       if size(k,1)==1
0042          ar=v_lpcrf2ar(2*rand(n,p+1)-1).*k(ones(n,1),:);
0043       else
0044          ar=v_lpcrf2ar(2*rand(n,p+1)-1).*k;
0045       end
0046    end
0047 else
0048    ar=ones(n,1);
0049 end

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