Orban OPTIMOD 6300 Operating Manual page 175

3-33
OPTIMOD 6300 DIGITAL OPERATION
TV 5B GEN PURP –LC (TV Five-Band General Purpose Without Loudness Controller):
This preset is the same as TV 5B-GEN PURPOSE except the Loudness Controller is
turned off and the MB D
control is backed off by 3 dB to achieve approximately
RIVE
the same loudness as TV 5B-GEN PURPOSE. Because the Loudness Controller is inac-
tive, this preset has more dynamic punch than TV 5B-GEN PURPOSE. The five-band
processing makes the audio spectrum more consistent than does TV 2B-GEN PURP –
LC, so TV 5B-GEN PURP –LC controls loudness better than TV 2B-GEN PURP –LC
even though the Loudness Controller is inactive.
TV 2B-DRAMA (TV Two-Band Drama): uses the 8585's soft knee compression and
AGC R
ATIO control to regulate loudness while still preserving some of the dynamic
range of the original mix. This preset sounds very smooth and natural with modern
sound mixes for scripted dramas. The 8585's Loudness Controller is exploited to limit
loudness to a maximum level. Typically, the Loudness Controller will produce 1 to 3
dB of gain reduction with dialog at normal levels and may produce as much as 12 dB
of gain reduction with very loud sound effects or commercials.
Because it preserves some dynamic range, it is important that the input level to the
8585 not be too far awry. Usually, network feeds will meet this requirement but lo-
cal playout of older material that has not been checked for loudness by a long-term
Loudness Level meter like ITU-R BS.1770 may not work well. Use one of the general-
purpose presets for this kind of material.
TV 5B-DRAMA (TV Five-Band Drama): like its 2B counterpart, uses the 8585's soft
knee compression and AGC R
ATIO control to regulate loudness while still preserving
some of the dynamic range of the original mix. In addition, the five-band compres-
sor automatically re-equalizes material that may otherwise sound spectrally unbal-
anced. The center channel compressor effectively de-esses dialog without punching
holes in the remaining channels. Coupling between the center channel and remain-
ing channels allows the center channel's level to be boosted automatically by as
much as 3 dB with respect to the other channels if this is needed to help intelligibil-
ity.
We prefer this preset to TV 2B-D
RAMA because of its effective, unobtrusive de-essing
and because it is more resistant to spectral gain intermodulation, which is program
material in one frequency range's audibly pumping material in a different range.
Like its two-band counterpart, this preset is sensitive to input levels because its com-
pression ratio is finite. It also fully exploits the Loudness Controller, which usually
shows slight gain reduction with dialog at normal levels.
TV 5B-DRAMA COUPLD (TV Five-Band Drama Coupled): is similar to TV 5B D
RAMA
but uses more interband band coupling in the five-band compressor and a slower
multiband compressor release time so it performs less automatic re-equalization of
the program material. This is an alternative to TV 2B D
that de-esses more ef-
RAMA
fectively.
TV 5B-NEWS (TV Five-Band News): rides gain more quickly than the general-
purpose presets. Its AGC release time is faster, so it will bring up low-level material
more quickly. It is designed for live news programs where input levels may be quite
unpredictable. It also automatically re-equalizes substandard audio (which is quite