[DUG] linear audio volume to db conversion

[Mark Howard]

Ross
I seem to recall that a doubling of sound pressure equates to an increase of 3 dB.
ie 103 dB is twice the sound pressure of 100 dB.
HTH
Mark
On Sun, 19 Jun 2005 00:25:31 +1200, Ross Levis <ross at stationplaylist.com> wrote:

> I was never any good at logarithms.
>
> I need to convert a linear audio volume to decibels.  The values start at 0 being silence and 127 being maximum.  This needs to be translated to db starting at 0db being maximum volume, and going negative to like -20db being a low volume.  This will be a VU meter.  I'm sure I need to use the Log10 math function, but I'm lost.
>
> Many thanks,
> Ross.
>



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