Encoding the signal with 14 bits

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Pat
Pat il 14 Set 2012
[f1,Fs1] = wavread('bird.wav');
sound(f1, Fs1);
i tried using
D=int14(f1* 8192)
I get error
Undefined function 'int14' for input arguments of type 'double'.
please help
  1 Commento
Walter Roberson
Walter Roberson il 14 Set 2012
You should be considering the Fixed Point Toolbox.

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Risposte (1)

Star Strider
Star Strider il 14 Set 2012
Modificato: Star Strider il 14 Set 2012
I cannot find any reference to int14 in the online MATLAB documentation. If you want to truncate to 14 bit precision, there are two ways to do it with f1 being defined as a column vector. In my experience, .wav files are read as a [N x 2] matrix (one column for each stereo channel), so you will have to encode each column of f1 as 14-bit integers as separate operations. For column 1:
D = dec2bin( (f1(:,1) * 8192), 14);
or if D results a binary string longer than 14 bits, and since binary numbers are defined as strings:
D = dec2bin(f1(:,1) * 8192);
D = D(:,1:14);
then if you want to:
D = int16(bin2dec(D));
They will all be stored as 16-bit signed integers, but truncated in precision to 14 bits.
  27 Commenti
Walter Roberson
Walter Roberson il 24 Set 2012
In 16 bit you do not need those manipulations as datatype int16() or uint16() are already the correct size for that purpose.
Pat
Pat il 28 Set 2012
ok walter thank u

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