How to perform bitwise xor operation for audio scrambling??

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Su Latt Sandi 2018-2-4

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评论： Su Latt Sandi 2018-2-5

Hello,

I using DWT and make scrambling for mono type audio. In my research, i need to use bit wise xor function for audio coefficients and keys. First, I change the format of audio coefficients from negative float value to 64 bit binary value using "c=num2bin(q,c)" where q is quantizer and c is audio coefficients. The problem is i can't xor with audio coefficients and key. This error occur " Undefined function 'bitxor' for input arguments of type'char'. " How should I continue to get audio scrambled value?? PFA for errors

I would be grateful if someone help me in this matter :)

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Walter Roberson 2018-2-4

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编辑：Walter Roberson 2018-2-4

Subtract '0' (the character for the digit 0) from the char to get the numeric values.

However, in your previous post on this topic, it was recommended that you use other approaches: in particular typecast to uint64 and then bitget().

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Walter Roberson 2018-2-4

在 MATLAB Online 中打开

What is test in this context? I can tell from the error message that whatever it is a scalar value that is not int64 or uint64

I would like to take this opportunity to again recommend that you do not use num2bin() and bin2num() for this work.

[sound, fs] = audioread('SomeFileName.wav');
sound_bits = reshape( (dec2bin(typecast(sound, 'uint8'), 8) - '0').', 1, []);

Su Latt Sandi 2018-2-5

Thanks Sir, it's working properly, and as I'm beginner in Matlab so I'm sorry if i make mistake. And I want to know how to convert back to get values that range of -1 to +1 to write audio.

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