Can analog to digital conversion is implemented in matlab (not simulink)?

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clear;
clc;
data_size=100;
M=2;
freq_sep=500;
nsamp=6;
fs=10000;
y=wavread('voice');
partition=[-.8,-.6,-.5,-.4,-.3,-.2,-.1,0,.1,.2,.3,.4,.5,.6,.8];
codebook=[0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15];
% Now optimize, using codebook as an initial guess.
[partition2,codebook2] = lloyds(y,codebook);
[index,quants,distor] = quantiz(y,partition,codebook);
[index2,quant2,distor2] = quantiz(y,partition2,codebook2);
%Compare mean square distortions from initial and optimized
[distor, distor2] % parameters.
quantization=dec2bin(quants,4);
x=str2num(quantization,1);
fsk_mod=fskmod(x,M,freq_sep,nsamp,fs);
noise=awgn(fsk_mod,0);
fsk_demod=fskdemod(noise,M,freq_sep,nsamp,fs);
[num,rate]=biterr(quants,fsk_demod)
%sound(fsk_demod)

Accepted Answer

Walter Roberson
Walter Roberson on 8 May 2012
Analog to digital conversion requires hardware to do the conversion, and so cannot be done by the MATLAB programming language itself. However, MATLAB offers interfaces to a number of kinds of A/D hardware, anywhere from microphone input to high-speed external-triggered boards. The more complex facilities are part of the Data Acquisition Toolbox.
If you could be more specific about your A/D hardware or about your conversion needs, someone might be able to offer more specific assistance.
  5 Comments
Walter Roberson
Walter Roberson on 9 May 2012
Have you considered reading the file using the 'native' option of wavread() ? You would probably (but not certainly) get an integer data stream as a result instead of a floating point stream. Then if you have the signal processing toolbox (I think it is), de2bi() to get the corresponding numeric bits for each integer.

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More Answers (1)

Walter Roberson
Walter Roberson on 9 May 2012
dec2bin() does not produce binary. dec2bin() produces character strings. "binary" as needed for signal processing is always numeric, never character. You must stop using dec2bin() and use something else instead, or you must find a way of converting the output of dec2bin() into numeric binary.

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