Orban OPTIMOD 6300 Operating Manual page 86

2-32
INSTALLATION
When set to In, the 6300 adds "high-pass" dither before any truncation
of the output word. The amount of dither automatically tracks the set-
ting of the W
erably reduces added noise in the midrange by comparison to white PDF
dither. However, unlike extreme noise shaping, it adds a maximum of 3
dB of excess total noise power when compared to white PDF dither. Thus,
it is a good compromise between white PDF dither and extreme noise
shaping.
To ensure maximum system linearity, it is wise to set this control to I
J) Set DO1 F
to AES.
RMT
K) Using the DO1 S
reo enhancement, equalization, AGC, 2-Band or 5-Band compression, and
look-ahead peak limiting).
No other output source will work correctly with Dialnorm.
L) Press N . Then set the DO1 E
EXT
S /D
TEREO UAL
it emits both mono signals from a single AES3 output.
M) Press N . Then adjust DO1 100% set the desired peak headroom in units of
EXT
dB below full-scale.
Setting Output Loudness in Dolby Digital transmissions: When you
have assigned the Dialnorm R
driving the Dolby Digital channel, the DO 100% control for that output
no longer adjusts loudness. Instead, it sets the 6300's maximum peak
output level with respect to 0 dBFS, which allows you to compensate for
transmission channels that introduce peak overshoots. For example, if
you lower an output control from 0 dBFS to –2 dBFS, the 6300 automati-
cally reduces the gain following its peak limiter by 2 dB and simultane-
ously increases the drive into the look-ahead limiter by 2 dB. Hence, the
average output level does not change but the maximum peak output
level is constrained to –2 dBFS
from the 6300's handling of Dialnorm—if you have set the D
trol correctly on the 6300, you can change the output level control freely
without causing your loudness to be incorrect with respect to other
Dolby Digital transmissions.
To set the output loudness, adjust the D
L D
IMITER RIVE
6300's Output Level meter indication to change.
Adjusting D
cation on the 6300's CBS Loudness Level meter or the amount of gain re-
duction in the loudness controller. The peak limiter's gain reduction will
change. This is the preferred method if the 6300's loudness controller is
1
If this causes large amounts of gain reduction to occur in the look-ahead limiter,
the average level will decrease somewhat. However, this will only happen with
pathologically high settings of Dialnorm and will never happen at the settings of
Dialnorm typically used in broadcasts (around –24 dB).
L
control. This first-order noise shaped dither consid-
ORD EN
button, set the digital 1 output source to MB+LIM (ste-
OURCE
parameter to S
MITS
is the normal setting. When the 6300 is in D
EFERENCE
1
. This unconventional arrangement results
control in the active processing preset. Both methods cause
IALNORM changes output loudness without changing the indi-
ORBAN MODEL 6300
/D
.
TEREO UAL
M
UAL ONO
O
UTPUT to the 6300 digital output
IALNORM
value or adjust the MB
IALNORM
.
N
mode,
con-