What is the amplitude unit when we plot wav. files?

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Hello, I work with bioacoustics and in my analysis I usually use softwares like Raven 1.4 and Adobe Audition. However, I've been urged to apply Matlab in my analysis.
I need to calculate underwater sound pressure levels. I usually take the values provided by Adobe (in dBFS) and perform the necessary conversions and calculations to obtain SPL. In Matlab I need to what is the amplitude unit when I open wav. files.
Can I calculate SPL directly from the wav. file using the amplitude levels and calibration data or do I need to insert a calibration file separately?
Thank you, Lis

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Walter Roberson
Walter Roberson 2013년 9월 3일
편집: Walter Roberson 2013년 9월 3일
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Walter Roberson
Walter Roberson 2013년 9월 3일
They are normalized, with -1 to correspond to the minimum voltage that can be produced by the line driver, and +1 to correspond to the maximum voltage that can be produced by the line driver.

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Daniel Shub
Daniel Shub 2013년 9월 3일
Wav files come in two varieties. The first has a range -1 to 1 and the second has the range 0 to 255. For the first 20*log10(x) corresponds to dB FS while for the second 20*log10((x-128)/255) gives dB FS.
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Mohammed Alkhatib
Mohammed Alkhatib 2022년 6월 12일
he is right you are wrong. he said its dB FS in that case you dont need to divide but if its dBSPL then you have to divide by P0

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