quantize/digitize wav file

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how can I digitize/quantize .wav file in matlab
well, basically i am trying to modulate it,
[X, Fs, nbits] = wavread('filename');
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]
  1 Comment
jessica david
jessica david on 25 Mar 2011
I am guessing, i need to digitize it or something

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Accepted Answer

Walter Roberson
Walter Roberson on 25 Mar 2011
You need to quantize, just like you did for your generated signal in your earlier versions.
Walter Roberson
Walter Roberson on 25 Mar 2011
http://www.mathworks.com/help/toolbox/comm/ref/qammod.html documents that if there are multiple rows in x that the columns will be processed independently, so it is fine to pass multiple columns to qammod. So just process the channels of the wav file through quantize independently and paste the result together:
qX = [quantiz(X(:,1),...,0:M-1), quantiz(X(:,2),...,0:M-1];
and pass qX to qammod.

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