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How can we convert negative double value to binary value in matlab?

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Su Latt Sandi
Su Latt Sandi 2018-2-3
评论： Walter Roberson 2018-2-4
I'm the student of UCSY.I research for audio scrambling. In my research, I need to scarmble audio data with key using bit wise xor.Now,I have difficulties to convert negative float value to binary value to scramble. Please, anyone can help me?? I would be grateful if someone help me in this matter.
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Walter Roberson
Walter Roberson 2018-2-4
num2bin() is for Fixed Point Objects, not for general numbers.
num2bin returns characters, so subtract '0' (the character for the digit 0) to get the numeric values.

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Walter Roberson
Walter Roberson 2018-2-3
If you are reading the audio data from a file, I recommend that you add the 'native' option. That would usually result in the data being read in as integer, which you can then manipulate.
Otherwise, easiest is probably to typecast() the floating to integer form.

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Matt J
Matt J 2018-2-3
编辑：Matt J 2018-2-3
Use BITGET, for example,
>> bitget(-25,1:8,'int8')
ans =
1 1 1 0 0 1 1 1
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Walter Roberson
Walter Roberson 2018-2-3
That only works for values that are integers.
You can experiment with
bitget(typecast(-25.2, 'uint64'), 1:8)
but beware that the byte order might not be what you are expecting.

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