>Could anyone provide some advice on how to to calculate decibels from a
>sample value for a peak meter...or perhaps just point me in the right
>direction?
It looks like Dennis Flood uses the same formulas I use. His:
( log( inputValue / maxInputValue ) )*10
I usually write it
20 log (P actual / P ref)
10
where P is the sound pressure. For multiple, uncorrelated sources, P actual
becomes the square root of the sum of the squares of P for the different
sources. In other words, for practical purposes,
20 log (sqrt(P ^2 + P ^2 + ... P ^2)
10 1 2 n
which is the same as
10 log (P actual / P ref)
10
I hope the formatting comes out ok--I had to put subscripts on the line
below since html e-mail is frowned upon (there is an email still smoldering
in my system, somewhere, from an html post I did 3 years ago).
Cordially,
Kerry Thompson
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