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
More Answers (1)
Daniel Shub on 3 Sep 2013
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.