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Amplitude
inadaze
post Jul 7 2004, 18:57
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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
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Pio2001
post Jul 8 2004, 23:48
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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.
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merbanan
post Jul 9 2004, 10:40
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10*log10(sample_vector)

try that in matlabcode.
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