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Topic: Amplitude (Read 3019 times) previous topic - next topic
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Amplitude

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

Amplitude

Reply #1 –
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.
 

Amplitude

Reply #2 –
10*log10(sample_vector)

try that in matlabcode.