3-42
OPERATION ORBAN
MODEL
9400
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
M
AXIMUM
D
ELTA
G
AIN
R
EDUCTION
control to 3.0 and the
AGC
M
ASTER
D
ELTA
T
HRESHOLD
control to some positive number, depending on how much automatic width control
you want the 9400 to perform.
AGC Bass Delta Threshold
works the same as
AGC
M
ASTER
D
ELTA
T
HRESHOLD
, but
applies to the bass band. You will usually set it the same as
AGC
M
ASTER
D
ELTA
T
HRESHOLD
.
Clipper Controls
The clipper controls apply only to the analog AM processing chain.
The HD AM chain uses a look-ahead limiter employing a different tech-
nology than the distortion-cancelled clipper used in the AM analog
chain.
Bass Clip
(“Bass Clip Threshold”) sets the threshold of Orban’s patented embedded
bass clipper with reference to the final clipper. The bass clipper is embedded in the
multiband crossover (after bands 1 and 2 are summed) so that any distortion created
by clipping is rolled off by part of the crossover filters. The threshold of this clipper is
usually set between 2 dB and 5 dB below the threshold of the final limiter in the
processing chain, depending on the setting of the
L
ESS
-M
ORE
control in the parent
preset on which you are basing your Modify adjustments. This provides headroom
for contributions from the other three bands so that bass transients don’t smash
against the back-end clipping system, causing overt intermodulation distortion be-
tween the bass and higher frequency program material.
Some 9400 users feel that the bass clipper unnecessarily reduces bass punch at its
factory settings. Therefore, we made the threshold of the bass clipper user-
adjustable. The range (with reference to the final clipper threshold) is 0 to –6dB. As
you raise the threshold of the clipper, you will get more bass but also more distor-
tion and pumping. Be careful when setting this control; do not adjust it casually. Lis-
ten to program material with heavy bass combined with spectrally sparse midrange
material (like a singer accompanied by a bass guitar) and listen for IM distortion in-
duced by the bass’ pushing the midrange into the clipping system. In general, unless
Clipper Controls
Full Modify Name
Advanced Name
Range
---
Overshoot Compensator Drive –2.0 … +2.0
BASS CLI
Bass Clip Threshold
–6.0 … 0.00 dB
B-CL SHAP
Bass Clip Shape
0 … 10
BASS MODE
Bass Clip Mode
Soft, Med, Hard, LLHard
---
Speech Bass Clip
–6.0 … 0.00 dB
FINAL CLIP
Final Clip Drive
–3.0 … +5.0 dB
HF-CL
HF Clip Threshold
–16…0.00, Off
---
Speech Bass Clip Threshold
---
Overshoot Comp Drive
–2.0 … +2.0
Table 3-6: Clipper Controls
Summary of Contents for Optimod-AM 9400
Page 1: ...Operating Manual OPTIMOD AM 9400 Digital Audio Processor Version 1 2 Software...
Page 7: ...Operating Manual OPTIMOD AM 9400 Digital Audio Processor Version 1 2 Software...
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Page 261: ...OPTIMOD AM DIGITAL TECHNICAL DATA 6 29...
Page 267: ...OPTIMOD AM DIGITAL TECHNICAL DATA 6 35 CPU Module...
Page 273: ...OPTIMOD AM DIGITAL TECHNICAL DATA 6 41 RS232 BOARD PARTS LOCATOR...
Page 275: ...OPTIMOD AM DIGITAL TECHNICAL DATA 6 43 8300 POWER SUPPLY PARTS LOCATOR...
Page 284: ...6 52 TECHNICAL DATA ORBAN MODEL 9400 DSP BOARD PARTS LOCATOR DRAWING 32170 000 14...
Page 292: ...6 60 TECHNICAL DATA ORBAN MODEL 9400 DISPLAY BOARD PARTS LOCATOR...
Page 293: ...OPTIMOD AM DIGITAL TECHNICAL DATA 6 61 DISPLAY BOARD...