CHAPTER 6 |
24
READING THE PROCESSING METERS
Meters are provided for monitoring input levels, Input AGC, Wideband AGC1, Multiband AGC and Limiters,
Multiband Noise Reduction, Multiband Stereo Enhancement, Wideband AGC2 post-multiband output and
individual left and right outputs. In the HD section, meters for the final look-ahead peak limiters and the final
output of the processing core are added while the AGC output meters are eliminated.
♦
The
ITU BS.1770 Input
meters indicate the level of the unprocessed source audio coming into Omnia.7
with floating peak indicators above each bar.
♦
The
Auto Balance
window (not shown) indicates any corrective left-to-right channel balancing being
performed.
♦
The
AGC
meter window shows the levels and action of the Input AGC and the Wideband AGC1 compres-
sors.
Depending upon the settings of the various Input AGC and Wideband AGC1 controls, the scale to the
left of the meter can display levels below threshold (positive numbers) as well as levels above threshold
negative numbers).
When the meters dip down below “0” the compressors are above threshold and therefore in a state of
gain reduction. When they rise above “0” they are below threshold and in a state of gain increase. The
combination of Input AGC and Wideband AGC1 gain is added together to determine the total amount of
AGC gain in place.
♦
The
Input AGC
levels are indicated by a bright yellow bar. The Wideband AGC1 levels are shown as a dark
orange bar extending below the Input AGC meter.
♦
The
Multiband
meter window shows the levels and action of the AGC, limiter, and noise reduction
sections for each band (ranging from 2 to 5 depending upon the preset employed). As is the case with the
AGC metering section, the scale will change based upon the settings of various multiband controls.
♦
The
AGC
level in each band is indicated by a bright yellow bar. The multiband limiter for each band is rep-
resented by a bright red bar that flashes beneath the AGC level. The multiband noise reduction for each
band is shown by a dark red bar that appears to drop down from the very top of the meter. Gating - the
condition in which release is significantly slowed down - is indicated by a dark red ribbon at the bottom
of the multiband AGC meters. Freezing - the condition in which release stops completely - is indicated by
the same red ribbon, but slightly brighter.
♦
If the
Wideband AGC2
compressor is enabled its meter will be displayed separately to the right of the
multiband display.
♦
The
Out
meters show the levels after the multiband processing section, but before the Bass Clipper and
Final Clipper.
♦
The
Mod
meters show the output of the L/R clipper relative to 100%.
