MATLAB: Quantize/digitize wav file

Question

how can I digitize/quantize .wav file in matlab

well, basically i am trying to modulate it,

[X, Fs, nbits] = wavread('filename');

M=16;

modulated_sig=qammod(X,M);

but it keeps giving me an error saying

??? Error using ==> qammod at 39 Elements of input X must be integers in the range [0, M-1]

Answer 1

You need to quantize, just like you did for your generated signal in your earlier versions.