On Fri, 19 Nov 2010 23:01:58 -0500, Randy Yates
wrote:
(Eric Jacobsen) writes:
The ratio of the level measured to the Full Scale level provides the
argument for the logarithm, and the scaled result is dBFS.
"the level measured"? I can immediately think of three different ways to
measure levels.
And the point remains:
If you measure peak, then the peak is the value referenced to Full
Scale.
If you measure RMS, then the RMS level is the value reference to Full
Scale.
If you measure furriness, then the furriness is the value referneced
to Full Scale.
I really don't see the source of the confusion.
The odd part is that you're not seeing this after being told correctly
what it is several times.
You don't define it with any precision yourself, Eric.
It's a very simple definition. dB is always pretty simple, scale the
log of the ratio of the value measured to the reference level.
The only possible complication is keeping the units compatible between
the reference and the measured value. In this case Full Scale can be
thought of as an amplitude or a power reference (and probably
interpreted otherwise as well).
You should know all this, and I suspect you do. It puzzles me why
this seems difficult.
--
Randy Yates % "Rollin' and riding and slippin' and
Digital Signal Labs % sliding, it's magic."
%
http://www.digitalsignallabs.com % 'Living' Thing', *A New World Record*, ELO
Eric Jacobsen
Minister of Algorithms
Abineau Communications
http://www.abineau.com