tutdpcm.m

数字通信第四版原书的例程

function tutdpcm
%TUTDPCM Shows a source coding example.
%       This function is called by the commhelp.html
%
%       See also: hmodem.

%       Wes Wang 11/20/95.
%       Copyright (c) 1995-96 by The MathWorks, Inc.
%       $Revision: 1.1 $  $Date: 1996/04/01 18:04:05 $

figure
t = [0:.1:40];
sig = sin(t);
[p_tran,codebook,partition]=dpcmopt(sig,1,8);
indx = dpcmenco(sig, codebook,partition,p_tran);
quant = dpcmdeco(indx, codebook, p_tran);
subplot(211);plot(t,indx);
title('Quantized digital output.');
subplot(212);plot(t,[sig;quant]');
title('Quantization recovery vs. orginal signal.');

%---end of tutdpcm---