OPTIMOD 6300 DIGITAL
OPERATION
3-43
2B GATE
(“2B Gate Threshold”) threshold control determines the lowest input level
that will be recognized as program material by OPTIMOD 6300; lower levels are con-
sidered to be noise or background sounds and will cause the AGC or 2-band com-
pressor to gate, effectively freezing gain to prevent noise breathing.
There are two independent gating circuits in the 6300 2-band structure. The first af-
fects the
AGC
and the second affects the
2-band compressor
. Each has its own
threshold control.
The 2-band gain reduction will eventually recover to 0 dB (when the
RELEASE
S
HAPE
is set to
L
INEAR
)
or to the setting of the
2B
D
RIVE
control (when the
RELEASE
S
HAPE
is
set to
E
XP
). However, recovery is slow enough to be imperceptible. This avoids
OPTIMOD 6300’s getting stuck with a large amount of gain reduction on a long,
low-level musical passage immediately following a loud passage.
In
E
XP
release mode, the 2-band gate’s gated gain reduction is the same
as the setting of the
2B
D
RIVE CONTROL
,
which is similar to the behavior of
the AGC gate. This is because
E
XP
release is mainly useful in sound-for-
picture processing and is used in the
TV
2B
G
EN
P
URPOSE
and
TV
2B
G
EN
P
URP
+LC
presets. In these presets, the AGC is defeated so that all gain
riding can occur in the 2-band compressor. See
AGC Idle Gain
on page 3-
36 for a more complete discussion.
It is common to set the
2B
G
ATE
control between approximately –35 dB and –25 dB.
Higher values are useful in sound-for-picture processing to prevent background
sounds and underscoring from being pumped up, while lower settings are more
common with musical programming.
BASS CPL
(“2B Bass Coupling”) is used to set the balance between bass and the rest
of the frequency spectrum.
The 2-band compressor processes audio in a master band for all audio above ap-
proximately 200Hz, and a bass band for audio below approximately 200Hz. The
B
ASS
C
PL
control determines how closely the balance of material below 200Hz
matches that of the program material above 200Hz.
Bass coupling is set to 100% on all of the 2-band presets because these presets are
designed to do gentle gain riding without increasing program density or signifi-
cantly modifying the spectral balance of the program. When bass coupling is set to
100%, the bass band will usually have the same amount of gain reduction as the
master band. Only with material having unusually heavy bass will you see additional
gain reduction in the bass band.
Bass Clip
(“Bass Clip Threshold”): See page 3-38.
Loudness Threshold
sets the maximum subjective loudness allowed by the process-
ing with reference to the input of the 6300’s multiband look-ahead limiter (2-band
or 5-band). It is most useful in 2-band mode because the 5-band compressor creates
more uniform loudness than does the 2-band compressor/limiter.
Содержание OPTIMOD 6300
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