Byte data extraction and interpretation from a WAVE sound file

Hello,
I'm trying to extract the signal data from a WAVE-file for further processing. Suppose the WAVE-file is in 16 bit/stereo format - then I get (8 bit) low-byte and (8 bit) high-byte for the left channel first, and then the low- and high-order bytes for the right channel (I hope I've got it right this far).
Now since I'm interested in doing some frequency analysis on the signal, I need to have the amplitudes for every sample, but since each byte is signed I can't just compose the complete amplitude value from the two bytes for each channel. A simple way to solve this would be (I think) to check if a byte is negative, and if it is, store the absolute value of the byte + 127 in an integer. For example, the byte 11111111 would be interpreted as -128, but taking the absolute value and adding 127 produces 255 which would be the maximum "unsigned" value for an 8 bit binary number.
This seems like a quite "ugly" solution to me, and I don't really like ugly things. I haven't worked that much with binary math in Java, and my general knowledge on the subject is not very thorough in the first place. I would be very grateful for any suggestions.

Ok, I went to buy some food and came up with another solution:
Suppose I have a sample from one of the channels in my byte array "signal" and I want to compose a (signed) total amplitude of the two bytes in the array. Code:
byte[] signal = ... ; //Get the data
int amp = 0x0000;
amp = ((signal[1] & 0xFF) << 8) | (signal[0] & 0xFF);
Here I assume that the data is aquired in little-endian format. If you have a better solution, please let me know.

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Attachments:
Basic VISA_Test_1.vi ‏26 KB
Result_OfpulseWave.png ‏129 KB

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ROW 2:
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<FieldValue>C</FieldValue>
<Type></Type>
<Priority></Priority>
</Structure>
<Structure>
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<Length>N</Length>
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X                       Y                           Z
P                       Q                           R
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Byte data extraction and interpretation from a WAVE sound file

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