Orban OPTIMOD-FM 5700i, Руководство по эксплуатации

Страница: 199 / 335

OPTIMOD-FM DIGITAL OPERATION
3-35
those bands when the gate first turns on. This prevents obvious midrange coloration
under gated conditions, because bands 2 and 3 have the same gain.
The gate also independently freezes the gain of the two highest frequency bands
(forcing the gain of the highest frequency band to be identical to its lower neigh-
bor) and independently sets the gain of the lowest frequency band according to the
setting of the
DJ B
ASS
boost control (in the Equalization screen). Thus, without in-
troducing obvious coloration, the gating smoothly preserves the average overall fre-
quency response “tilt” of the multiband compressor, broadly maintaining the “au-
tomatic equalization” curve it generates for a given piece of program material.
Note: If the
M
ULTIBAND
G
ATE
T
HRESH
(Gate Threshold) control is turned
O
FF
, the
DJ B
ASS
control (in the Equalization screen) is disabled.
AGC Bass Coupling control clamps the amount of dynamic bass boost (in units of
dB) that the AGC can provide. (In V1.x, the unit of measure was percent.)
The AGC processes audio in a master band for all audio above approximately 200 Hz
and a bass band for audio below approximately 200 Hz. Starting with V2.0 software,
the AGC Master and Bass compressor sidechains operate without internal coupling.
The gain reduction in the
B
ASS
audio path is either the output of the Bass compres-
sor sidechain or the output of the Master band sidechain. The AGC B
ASS
C
OUPLING
control sets the switching threshold. For example, if the AGC B
ASS
C
OUPLING
control
is set to 4 dB and the master gain reduction is 10 dB, the bass gain reduction cannot
decrease below 6 dB even if the gain reduction signal from the Bass compressor
sidechain is lower. However, the audio path bass gain reduction can be larger than
the master gain reduction without limit. In the previous example, the bass gain re-
duction could be 25 dB
The normal setting of the AGC
B
ASS
C
OUPLING
control is 0 dB, which allows the AGC
bass band to correct excessive bass as necessary but does not permit it to provide a
dynamic bass boost.
Note that the operation of this control was changed in 5700i V2 software to work as
explained above. You may have to tweak this control to achieve the same bass bal-
ance that you had previously with V1.x software.
AGC Max Delta GR determines the maximum gain difference permitted between
the two channels of the AGC. Set it to “0” for perfect stereo coupling.
This control works the same regardless of whether the AGC operates in
left/right or sum / difference
M
ATRIX
modes, in both cases controlling the
maximum gain difference between the “channels.” Depending on the
M
ATRIX
mode setting, the “channels” will handle left and right signals or
will handle sum and difference signals. When the AGC operates in sum /
difference
M
ATRIX
mode, this control determines the maximum amount
of width change in the stereo sound field.
Window Size determines the size of the floating “slow zone” window in the mas-
ter band of the AGC. (The Bass band is not windowed.)