1. Penghitung korelasi dan rate of distrotion dari PCM dan DPCM
========================================================= clear;
close all; clc;
========================================================= function [R,H]=countDistnama_file,D
Program penghitung korelasi dan rate of distortion load data;
e=2.7283; Dn=10.D.10;
nama_file=[a i u e o] nama_file=[p];
[y,fs,nbits]=wavreadnama_file; if fs=8000
inc=roundfs8000; fs=8000;
Sub sampling menjadi 8000 y=y1:inc:lengthy;
wavplayyin,8000 else
errorfs is lower than 8 Khz, Please use Fs=8 Khz; end
y=y.8192;
source untuk DPCM u=[y;0];
v=[0;y]; d=u-v;
Hitung korelasi ryy=xcorry,y;
rdd=xcorrd,d; x1=lengthryy-12;
delay1=[-x1:1:x1]; x2=lengthrdd-12;
delay2=[-x2:1:x2];
koefisien korelasi rhoyy=ryymaxryy; Normalisasi
rhodd=rddmaxrdd; Normalisasi
hitung probabilitas proby=histy,256lengthy;
probd=histd,256lengthd; proby=probyfindproby~=0;
probd=probdfindprobd~=0;
hitung entropy sumber Hy=sumproby.log10probylog102;
Hd=sumprobd.log10probdlog102; H=[Hy;Hd];
hitung lower bound untuk rate of distortion dari Shannon RDy=Hy-0.5.log102pi.e.Dn;
RDd=Hd-0.5.log102pi.e.Dn; R=[RDy;RDd];
RFS=R.fs;
ploting autocorellation subplot211;plotdelay1,rhoyy;
xlabelshift;ylabelCoefficient of Correlation; titleAutocorrellation of source signal for PCM;
grid on; subplot212;plotdelay2,rhodd;
xlabelshift;ylabelCoefficient of Correlation; titleAutocorrellation of source signal for DPCM;
grid on; figure;subplot211;plotDlog,RDy,-,Dlog,RDd,:ro;
ylabelRDbitsyimbol; xlabeldistortion D db;
titleShanon Lower Bound for Rate of Distortion RDFunction; legendPCM source,DPCM source;
grid on; subplot212;plotDlog,RFS1,:,-,Dlog,RFS2,:,:ro;
ylabelRDbitsecond; xlabeldistortion D db;
fs=fs1000; t=sprintfSampling Rate=.2f Khz,fs;
titlet; legendPCM source,DPCM source;
grid on;
2. Penghitung distorsi untuk ADPCM
function [Dlog,D,e,e2]=Distortionnama_file,N program penghitung distorsi untuk ADPCM
baca file [yin,fs]=wavreadnama_file;
if fs =8000 inc=roundfs8000;
fs=8000;
sub sampling menjadi 8000 yin=yin1:inc:lengthyin;
wavplayyin,8000; else
errorFs is lower than 8 Khz, Please use Fs = 8 Khz; end;
y14=yin.8192;
masukan ke enkoder ADPCM [I,sr,dout,dqout,yout,aiout,biout.tdout,trout,alout]=adpcmy14,N;
yout=sr.8192; wavplayyout,8000;
hitung distorsi e=yin-yout;
e2=e.2; D=meane2;
Dlog=10log10D;
3. Program ADPCM dengan standar G. 726
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