?? ditherq.m
字號:
function [y,zf]=ditherq(x,m,zi)
%DITHERQ add dither and quantize [Y,ZF]=(X,M,ZI)
% Inputs:
% x is the input signal
% m specifies the mode:
% 'w' white dither (default)
% 'h' high-pass dither (filtered by 1 - z^-1)
% 'l' low pass filter (filtered by 1 + z^-1)
% 'n' no dither
% Copyright (C) Mike Brookes 1997
% Version: $Id: ditherq.m,v 1.4 2007/05/04 07:01:38 dmb Exp $
%
% VOICEBOX is a MATLAB toolbox for speech processing.
% Home page: http://www.ee.ic.ac.uk/hp/staff/dmb/voicebox/voicebox.html
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% 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
% the Free Software Foundation; either version 2 of the License, or
% (at your option) any later version.
%
% 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
% GNU General Public License for more details.
%
% You can obtain a copy of the GNU General Public License from
% http://www.gnu.org/copyleft/gpl.html or by writing to
% Free Software Foundation, Inc.,675 Mass Ave, Cambridge, MA 02139, USA.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
s=size(x);
n=length(x);
if nargin<3 | ~length(zi)
zi=rand(1);
end
if nargin<2
m='w';
end
if any(m=='n')
y=round(x);
elseif any(m=='h') | any(m=='l')
v=rand(n+1,1);
v(1)=zi;
zf=v(end);
if any(m=='h')
y=round(x(:)+v(2:end)-v(1:end-1));
else
y=round(x(:)+v(2:end)+v(1:end-1)-1);
end
else
y=round(x(:)+rand(n,2)*[1;-1]);
zf=rand(1); % output a random number anyway
end
if s(1)==1
y=y.';
end
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