Sound quantization on matlab

Hello,

We need for a project at school , to use matlab to quantize a sound (.wav) , we searched on internet but found nothing about that , if someone know how to do that , it would be great

Thanks in advance

[NITIN]

load voice.mat
subplot(3,1,1);
[x,fs]=audioread('voice.wav');
info = audioinfo( 'voice.wav');
N=length(x);
T=2.9520;
t=linspace(0,T,N);
plot(t,x);
xlabel('time')
ylabel('x(t)')

y=abs(fftshift(fft(x)));
F=linspace(-fs/2,fs/2,N);

subplot(3,1,2);
plot(F,y);
xlabel('frequency')
ylabel('x(f)')
Xmax=max(x);
Xmin=min(x);
xd = Xmax - Xmin ;
L=4;
Delta =(xd/L);
q=(Xmin-Delta/2):Delta:(Xmax+Delta/2);
q=q(2:end-1);
DTV=zeros(1,L-1);
for i=1:(L-1)
    DTV(i)=(q(i+1)+q(i))/2;
end
[i,Xq]=quantiz(x,DTV,q);
subplot(3,1,3);
plot(t,Xq);

Answer 1

[Walter Roberson]

http://www.mathworks.com/help/comm/ref/quantiz.html

http://www.mathworks.com/help/signal/ref/uencode.html

Answer 2

[Loïc Leb]

Thanks a lot , it worked with that , just a last question , do u know how to do non uniform quantization ?

Thanks for ur help

[Annisaa Auliyaa Septianthy]

Can I ask for the script u made? thx.

[Walter Roberson]

quantiz does non-uniform quantization if the partitions are non-uniform.