Hi,
I have been recording sounds in Matlab and ploting them to see the shape of the envelope. I understand that the signal is displayed over time and has a general amplitude(from 1 to -1).
My question is how can I convert this general amplitude into something useful like values in dB or voltage. Does anyone know?

Thanks
Jay

L being the level displayed, the formula for the voltage is trivial :

V = Vmax x L

In db, it is

20 x log10 (L)

I never used mathlab, so I can't help you to use these formulae.

10*log10(sample_vector)

try that in matlabcode.