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List:       sox-users
Subject:    Re: [SoX-users] Getting Decibel from Amplitude
From:       Ulrich Klauer <ulrich () chirlu ! de>
Date:       2012-11-07 13:03:42
Message-ID: 20121107140342.Horde.-FZ0eruWis5QmlwuM07SVPA () webmail ! df ! eu
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Hernando Rugay <rugay.hernando@gmail.com>:

> Can anybody help me getting the decibel..

The easiest way would be to use the "stats" effect instead of the  
"stat" effect, as stats outputs dBFS values. :)

But apart from that, you already have the right formula. The reference  
level for dBFS is full scale, which is 1. So, to convert a sample  
value of 0.172607 into dBFS, you just calculate 20*lg(0.172607/1) =  
20*lg(0.172607) = 20*(-0.762941596) = -15.258831913.

Ulrich


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