From: Susan Kitchens <susan@au...> - 2005-08-27 03:40:08
After Rich's FABULOUS explanation of recording levels ("aim for -12
db") in the Normalizing Questions thread about 10 days ago or so (See
Audacity Digest #1368 or message here:
http://sourceforge.net/mailarchive/message.php?msg_id=12648666 ), I'm
trying to understand the DB meters in Audacity a bit more.
What kind of db measurement is Audacity using?
The reference I'm using for decibels in their various forms is on/comes
from this web page by Jim Price
dBV represents the level compared to 1 Volt RMS. 0dBV = 1V. There is no
reference to impedance.
dBu represents the level compared to 0.775 Volts RMS with an unloaded,
open circuit, source (u = unloaded).
dBm represents the power level compared to 1 mWatt. This is a level
compared to 0.775 Volts RMS across a 600 Ohm load impedance. Note that
this is a measurement of power, not a measurement of voltage.
dbFS - relative to digital full-scale.
dB SPL - A measure of sound pressure level.
Based on the above definitions and Jim Price's further elaboration on
> 0 dBFS represents the highest possible level in digital gear. All
> other measurements expressed in terms of dBFS will always be less than
> 0 dB (negative numbers).
...my educated (?) guess is that Audacity's DB meters are dbFS, or the
digital full scale ones.
Is my guess correct?
Susan A. Kitchens
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