Avid Technology Pro Tools HD 7.2 - Manual (Page 93)

Chapter 7: Plug-in Features and Enhancements 87
Auto Reset When enabled, causes the start time
of the Leq(A) measurement window to be auto-
matically reset whenever playback starts in
Pro Tools.
Hold on Stop When enabled, causes the Leq(A)
measurement window timer to pause when
playback stops, and resume when playback be-
gins again.
SignalTools Level Meters
The SignalTools plug-ins let you choose the type
of metering to use. Each meter type has a differ-
ent metering scale and response.
Meter Types
Peak (Default meter type) Uses the metering
scale in DigiRack EQ III and Dynamics III plug-
ins.
RMS (Root Mean Square) was used in previous
versions of the Digidesign SurroundScope plug-
in and uses the same “true” RMS metering scale.
Peak + RMS Uses a multi-color display to show
both types of metering. Peak metering is shown
in conventional green color, while RMS meter-
ing is shown in blue.
VU (Volume Unit) Uses AES standards for signal
level indication.
BBC Uses IEC-IIa standards for signal level indi-
cation. This style of metering suppresses short
duration peaks that would not affect broadcast
program material. Reference calibration (4 dB) is
–18 dBFS.
Nordic Uses IEC Type I standards for signal level
indication and provides greater resolution for
readings between –10 dBu and +4 dBu. Refer-
ence calibration (0 dB) is –18 dBFS.
DIN Uses IEC Type I standards for signal level in-
dication and provides greater resolution for
readings between –10 dBu and +5 dBu. Refer-
ence calibration (–9 dB) is –18 dBFS.
VENUE Provides Peak metering behavior with a
meter scale calibrated specifically for Digidesign
VENUE systems. Reference calibration (0 dB) is
–20 dBFS.
In any of the Loop Transport modes, the
measurement start time is automatically re-
set each time playback goes back to the be-
ginning of the loop.
SignalTools level meters
Reference
mark
Meter Type
selector
Peak Hold
selector
The “true” RMS meter scale is not the same
as the AES 17 RMS scale. For a sine wave
with a peak value of –20 dBFS, the “true”
RMS meter will show a value of –23 dBFS.
(The same sine wave will show a value of
–20 dBFS on an AES 17 RMS meter.‚
Meter values are always displayed on con-
trol surfaces in dBFS values, regardless of
the Meter Type setting.