Byte Array to Double Array

Question

I have an array of bytes representing data from a .wav file. I want to convert it to an array of doubles, so that I can do operations such as FFT on it to determine whether one file is contained in the other.

Right now, I simply cast the bytes to doubles, which gives me decent results, but not as precise as I would like. I know this is improper conversion, and I feel like it is causing me to miss data, because of the difference in what bytes and doubles represent.

How can I convert the byte array to a double array properly before doing the FFT correlation?

How do you want to convert it to double? I mean if you have byte[] bArr; where size of bArr is 8, do you want to convert 8 bytes to 1 double, or do you want to convert such array to array of 8 doubles? — Eternal Noob
– Eternal Noob, Commented Dec 1, 2010 at 0:54

Michael Borgwardt · Accepted Answer · 2010-11-30 23:46:21Z

4

If each byte actually represents a signed 8-bit sample value, then the data has been lost when the sample was recorded, and there is nothing improper or imprecise about casting to double (which can accurately represent all values that byte can) - there isn't really anything else you can do.

answered Nov 30, 2010 at 23:46

Michael Borgwardt

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