How can we convert negative double value to binary value in matlab?
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Su Latt Sandi
on 3 Feb 2018
Commented: Walter Roberson
on 4 Feb 2018
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.
6 Comments
Walter Roberson
on 4 Feb 2018
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.
Accepted Answer
Walter Roberson
on 3 Feb 2018
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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More Answers (1)
Matt J
on 3 Feb 2018
Edited: Matt J
on 3 Feb 2018
Use BITGET, for example,
>> bitget(-25,1:8,'int8')
ans =
1 1 1 0 0 1 1 1
1 Comment
Walter Roberson
on 3 Feb 2018
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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