Creating a Array of binary values

João Filipe Silva

2015 9 8

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I'm trying to do the quantization of a wav file on Matlab, but I'm struggling to get this function right.

Quant = zeros(1,length(y));
Q = peak2peak(y);
N = 2^8;
Delta = double(Q)/double(N); %Analog aproximation of each value on y
Faixa = 0:Delta:double(Q)-Delta;  %Array of 256 analog values
    for k1 = 1:length(y)
        for k2 = 1:N-1
            if (y(k1)>Faixa(k2) && y(k1)<=Faixa(k2+1)) 
                Quant(k1) = dec2bin(k2,8);  %Saving on array Quant the binary value corresponding to its analog comparison
                break
            end
        end
  end

Y has 16000 values, and I'm getting the following message: In an assignment A(I) = B, the number of elements in B and I must be the same.

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Matthew Eicholtz 2015-9-8

The reason you are getting that error is because you are trying to store an 8-bit binary string (dec2bin(k2,8)) in a double array index with 1 row ( Quant(k1)). MATLAB does not like this.

I'm not sure what you want Quant to look like, but 2 options are:

Make Quant a cell array of length(y) and store the binary strings in each cell.
Make Quant have 8 rows (or columns depending on your desires), and store the 8-bits that way.

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