Orban Optimod-FM 8300 Operating Manual page 161

3-43
OPTIMOD-FM DIGITAL OPERATION
maximum loudness and density on small radios achievable by the Two-Band struc-
ture. However, such processing may fatigue listeners with high-quality receivers, and
requires you to activate the AGC to control the average drive level into the two-
band compressor, preventing uncontrolled build-up of program density. Instead of
operating the Two-Band structure like this, you should choose a Five-Band preset in-
stead.
Bass Clip ("Bass Clip Threshold"): See page 3-33.
2B Clip is a compression threshold control that equally affects the bass and master
bands. It sets the drive level to the high frequency limiting and multiband distortion-
controlling processing that precedes the final clipping section. The distortion-
controlling section uses a combination of distortion-cancelled clipping and look-
ahead processing to anticipate and prevent excessive clipping distortion in the final
clipper.
2B High Frequency Limiting sets the threshold of the high frequency limiter in
the Two-Band structure. When this control is set lower, gain reduction does more
high frequency limiting. When this control is set higher, distortion-cancelled clipping
does more high frequency limiting. This control controls the tradeoff between loss
of high frequencies (due to high frequency limiting) and excessive distortion (due to
clipping).
2B 6-15 kHz Frequency Limiter sets the amount of additional gain reduction oc-
curring in 6-15 kHz band of the 2-band high frequency limiter. This extra gain reduc-
tion is triggered whenever high frequency energy would otherwise cause excessive
distortion in the final clipper. The algorithm uses an analysis of the activity in the fi-
nal clipper to make this determination.
Functionally, this control is a mix control that adds a HF limiter gain reduction signal
to higher of the two bands of the 2-band high frequency limiter. Higher settings
produce more extra HF limiting in this band. The control therefore allows you to
trade off reduced high frequency distortion against HF loss.
FINAL CLIP ("Final Clip Drive"): See page 3-33.
COMP DRV ("Composite Limiter Drive"): See page 3-34.
PARENT PRESET and LESS-MORE INDEX are read-only fields.
The 8300's front-panel LCD display does not show all of the parameters in a given
User Preset; only the PC Remote software can display the Advanced Controls that set
all the parameters. P shows the preset that was edited to produce the
P
ARENT RESET
current User Preset. The L shows the Parent Preset's Less-More set-
-M I
ESS ORE NDEX
ting when it was edited. This information is needed because two different User Pre-
sets can appear to be the same when you view only the parameters that the 8300's
front panel exposes.
Please note that if a User Preset was created by in the PC Remote software by edit-
ing Advanced controls, an asterisk will appear in front of the displayed parent pre-
set. This asterisk means that you cannot duplicate a given user preset by starting