OPTIMOD-FM DIGITAL
OPERATION
3-31
ratio to as low as 2:1. This can add a sense of dynamic range and is mostly useful for
subtle formats like classical and jazz.
This control reduces the available range of AGC gain reduction because it acts by at-
tenuating the gain control signal produced by the AGC sidechain. The range is 25 dB
at
:1 and 12 dB at 2:1. However, the range of input levels that the AGC can handle
is unaffected, remaining at 25 dB.
AGC Bass Threshold
determines the compression threshold of the bass band in the
AGC. It can be used to set the target spectral balance of the AGC.
As the
AGC
B
C
PL
control is moved towards “100%,” the
AGC
B
ASS
T
HRESHOLD
con-
trol affects the sound less and less.
The interaction between the
AGC
B
ASS
T
HRESHOLD
control and the
AGC
B
C
PL
con-
trol is a bit complex, so we recommend leaving the
AGC
B
ASS
T
HRESHOLD
control at
its factory setting unless you have a good reason for readjusting it.
AGC Idle Gain
. The “idle gain” is the target gain of the AGC when the silence gate
is active. Whenever the silence gate turns on, the gain of the AGC slowly moves to-
wards the idle gain.
The idle gain is primarily determined by the
AGC
D
RIVE
setting — a setting of 10 dB
will ordinarily produce an idle gain of –10 dB (i.e., 10 dB of gain reduction). How-
ever, sometimes you may not want the idle gain to be the same as the
AGC
D
RIVE
setting. The
AGC
I
DLE
G
AIN
control allows you to add or subtract gain from the idle
gain setting determined by the
AGC
D
RIVE
setting.
You might want to do this if you make a custom preset that otherwise causes the
gain to increase or decrease unnaturally when the AGC is gated.
For example, to make the idle gain track the setting of the
AGC
D
RIVE
control, set
the
AGC
I
DLE
G
AIN
control to zero. To make the idle gain 2 dB lower than the setting
of the
AGC
D
RIVE
control, set the
AGC
I
DLE
G
AIN
control to –2.
AGC Bass Attack
sets the attack time of the AGC bass compressor (below 200Hz).
AGC Master Attack
sets the attack time of the AGC master compressor (above
200Hz).
AGC Bass Release
sets the release time of the AGC bass compressor.
AGC Master Delta Threshold
allows you to set the difference between the com-
pression thresholds of the sum and difference channels. (This control is only useful
when you set the
AGC
MATRIX
to
S
UM
/
DIFFERENCE
.) If you set the threshold of the
difference channel lower than the sum channel, the AGC will automatically produce
more gain reduction in the difference channel. This will reduce the separation of
material with an excessively wide stereo image (like old Beatles records). To make
this work, you must set the
AGC
M
AXIMUM
D
ELTA
G
AIN
R
EDUCTION
control away from
zero. For example, to limit an excessively wide image while preventing more than 3
dB difference in gain between the sum and difference channels, set the
AGC
Summary of Contents for 8300J
Page 1: ...Operating Manual OPTIMOD FM 8300 Digital Audio Processor Version 2 1 Software...
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