Orban OPTIMOD 8685, Operating Manual

Page: 171 / 357

OPTIMOD SURROUND PROCESSOR OPERATION
3-27
Presets beginning with “TVA” are tuned with the assumption that the 2.0 processing
is operating with 50
μ
s or 75
μ
s preemphasis and is driving an analog TV transmitter.
See step 11 on page 2-31. A given “TVA” preset’s surround processing is identical to
the surround processing in the corresponding “TV” preset, which is turned with the
assumption that the 2.0 processing will operate with no preemphasis (
F
LAT
); see step
10 on page 2-30.
TV 2B–GEN PURPOSE (TV Two-Band General Purpose): This preset accommodates
most dramatic programming (particularly older material), providing gentle gain con-
trol that limits dynamic range to a level that provides the general audience with
consistently intelligible dialog. It sounds very similar to Orban’s analog OPTIMOD-TV
(Model 8182A) when that unit is adjusted for “General” programming according to
the instructions in its operating manual. This preset retains the spectral balance of
its input as much as possible.
TV 2B-G
EN
P
URPOSE
is not the best choice for live news,
sports, or films with optical soundtracks. The Five-Band presets (see below) can
automatically equalize such program material when its spectral balance is inappro-
priate and can also apply single-ended dynamic noise reduction.
These presets defeat the AGC and do all gain riding with the two-band compressor,
which is set for reverse exponential release. This release characteristic does not sig-
nificantly increase the density of material whose level is well controlled while still
performing fast correction of levels that are too low. The Loudness Controller is ac-
tive, so this preset controls loudness tightly.
For modern dramatic programming mixed in surround, you may prefer the TV 5B-
Preset Names Normal Less-More
TV 2B-GEN PURP NO LC 5.0
TV 2B-GEN PURPOSE 5.0
TV 5B-GEN PUR W NR 5.0
TV 5B-GEN PURPOSE 5.0
TV 5B-GEN PURP NO LC 5.0
TV 2B-DRAMA 5.0
TV 5B-DRAMA 5.0
TV 5B-DRAMA COUPLD 5.0
TV 5B-NEWS 5.0
TV 5B-OPTICAL FILM 5.0
TV 5B-SPORTS 5.0
TV AGC+LC 5.0
TV AGC+LC+DS 5.0
TVA 2B-GEN PURP NO LC 5.0
TVA 2B-GEN PURPOSE 5.0
TVA 5B-GEN PUR W NR 5.0
TVA 5B-GEN PURPOSE 5.0
TVA 5B-GEN PURP NO LC 5.0
TVA 2B-DRAMA 5.0
TVA 5B-DRAMA 5.0
TVA 5B-DRAMA COUPLD 5.0
TVA 5B-NEWS 5.0
TVA 5B-OPTICAL FILM 5.0
Table 3-1: Factory Programming Presets (Sound-for-picture)