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| %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
[sig,FS,Nbits] = wavread ('voix_femme.wav');
MaxSig = max(abs(max(sig)),abs(min(sig)));
%%%%%%%%%%%%%%%% Amplification ou atténuation du signal %%%%%%%%%%%%
sig1 = sig/MaxSig;
sig2 = sig/MaxSig*0.2;
sig3 = sig/MaxSig*1.5;
%%%%%%%%%%%% compression selon la loi Mu %%%%%%%%%%%%
Mu = 255;
outMu1 = compand(sig1,Mu,1,'mu/compressor');
outMu2 = compand(sig2,Mu,1,'mu/compressor');
outMu3 = compand(sig3,Mu,1,'mu/compressor');
%%%%%%%%%%% quantification des signaux %%%%%%%%%%%%%%
delta=2/256;
partition=(-1+delta : delta :1-delta);
CodeBook=(-1+delta/2 : delta:1-delta/2);
[indices,signal_quant]=quantiz(y,transitions,niveaux);
[ind1, quantiz1] = quantiz(sig1, partition, CodeBook);
[ind2, quantiz2] = quantiz(sig2, partition, CodeBook);
[ind3, quantiz3] = quantiz(sig3, partition, CodeBook);
[indMu1, quantizMu1] = quantiz(outMu1, partition, CodeBook);
[indMu2, quantizMu2] = quantiz(outMu2, partition, CodeBook);
[indMu3, quantizMu3] = quantiz(outMu3, partition, CodeBook);
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
