3-18
OPERATION
ORBAN MODEL 6300
Instead of adjusting
L
ESS
-M
ORE
, you can adjust the
F
INAL
L
IMIT
D
RIVE
control (which
what
L
ESS
-M
ORE
actually does). Do not set the
F
INAL
L
IMIT
D
RIVE
control below “0”
with this preset; doing so will compromise system headroom.
Adjusting the
L
ESS
-M
ORE
or
F
INAL
L
IMIT
D
RIVE
controls is equivalent to si-
multaneously decreasing the threshold and increasing the make-up gain
in a protection limiter having threshold and output make-up gain con-
trols.
AGC+[FLAT, 50
s, 75
s] LIMITER:
These presets allow the 6300 to serve as a stu-
dio AGC, substituting for the AGC in an Optimod at a radio or television transmitter
and providing protection limiting for the STL that links the output of the 6300 to
the input of the Optimod at the transmitter.
Choose the preset that matches the 6300’s preemphasis setting (see step 8 on page
2-23). This step explains how to choose the 6300’s preemphasis setting to match your
STL.
The
50
S
and
75
S
presets have been tuned so that the 5-band compressor serves
only as a subtle high frequency limiter that uses bands 4 and 5 to perform a few dB
of fast gain reduction with program material having strong high frequency content.
Band 5 operates without stereo coupling. This way, HF limiting triggered by high
frequency energy in one audio channel will not modulate high frequencies in the
opposite channel.
The
F
LAT
preset is tuned so that it does not normally trigger gain reduction in the
6300’s 5-band compressor — the Optimod at the transmitter should be the processor
that performs this multiband compression.
All AGC presets use the look-ahead limiter to prevent overloading the STL on peaks.
Compared to
F
LAT
, the
50
S
and
75
S
presets progressively reduce the drive level to
the look-ahead limiter to prevent strong high frequency energy from triggering au-
dible gain pumping or ducking. The high frequency limiting action in the 5-band
compressor also helps prevent this artifact.
PROTECT
: This is a 2-band preset designed to produce no gain reduction unless it
encounters unusually high input levels caused by operator error. It uses the 2B com-
pressor to control excessive levels, so it more forgiving than the
L
OOKAHEAD
presets,
which offer only peak limiting.
FACTORY PROGRAMMING PRESETS (PROTECTION; AGC)
Preset Names
Source Preset
Normal Less-More
AGC+50us LIMITER
AGC+50us LIMITER
5.0
AGC+75us LIMITER
AGC+75us LIMITER
5.0
AGC+FLAT LIMITER
AGC+FLAT LIMITER
5.0
LOOK-AHEAD LIMITER
LOOK-AHEAD LIMITER
1.0
PROTECT PROTECT
1.0
SOFT KNEE 2B
SOFT KNEE 2B
5.0
Table 3-1: Protection and AGC Presets
Содержание OPTIMOD 6300
Страница 1: ...Operating Manual OPTIMOD 6300 Digital Multipurpose Audio Processor Version 1 1 Software ...
Страница 7: ...Operating Manual OPTIMOD 6300 Digital Multipurpose Audio Processor Version 1 1 Software ...
Страница 22: ......
Страница 48: ......
Страница 94: ...2 46 INSTALLATION ORBAN MODEL 6300 ...
Страница 118: ......
Страница 200: ......
Страница 214: ......
Страница 236: ...6 22 TECHNICAL DATA ORBAN MODEL 6300 CONTROL BOARD PARTS LOCATOR ...
Страница 242: ...6 28 TECHNICAL DATA ORBAN MODEL 6300 I O DSP BOARD PARTS LOCATOR ...
Страница 252: ...6 38 TECHNICAL DATA ORBAN MODEL 6300 FRONT VIEW REAR VIEW FRONT PANEL PARTS LOCATOR DIAGRAM ...
Страница 255: ...OPTIMOD 6300 DIGITAL TECHNICAL DATA 6 41 ...