how to quantize the audio file?

[y,fs]=audioread('handel.wav'); 
ft = y(:,1);   
sigLength = length(ft); %length
 t=(0:sigLength-1)/fs;   
figure;  
plot(t(1:200), ft(1:200)),grid;  
xlabel('Time(s)');  
ylabel('Amplitude');

then use a uniform quantizer to quantize the first 200 sampling points by 4 bits (L=16 levels).

Plot the Input wave and quantized output.

Answer 1

[Walter Roberson]

https://www.mathworks.com/help/comm/ref/quantiz.html -- signal processing toolbox

https://www.mathworks.com/help/matlab/ref/double.discretize.html -- general numeric

If you use discretize then you get out bin numbers, which you can use to index the edge vector that you passed in, in order to get out the value of the "beginning" of the edge.

Another hint I would give is to use the 'native' option for audioread()