Orban OPTIMOD 6300 Operating Manual page 88

2-34
INSTALLATION
change but the maximum peak output level is constrained to –2 dBFS.
This unconventional arrangement results from the 6300's handling of
D —if you have set D
IALNORM
change the 6300 output level control freely without causing your on-air
loudness to be incorrect with respect to other Dolby Digital transmis-
sions.
B) Skip this step if you do not plan to sync the 6300's digital output(s) to an ex-
ternal AES11 or wordclock signal.
If the Ext Sync control is not visible, press Next until the control appears. Set
the control for AES or Wordclock, as required.
C) Navigate to S > IO C
ETUP
D) Set the DO1 P - control to F
RE E
E) Set the DO1 R
ATE to match your transmission system.
F) Set the DO1 S
. Choose:
YNC
 I
(the output sample rate is synchronized to the 6300's internal crys-
NTERNAL
tal-controlled clock),
 I
NPUT (the output sample rate is synchronized to the sample rate appearing
at the 6300's AES3 input), or
 E
XTERNAL (the output sample rate is synchronized to the sample rate ap-
pearing at the 6300's BNC sync input when an AES11 signal or a wordclock
drives it).
G) Press N . Then set the desired output DO1 W
EXT
[14], [16], [18], [20], or [24], in bits
The largest valid word length in the 6300 is 24 bits, which is the recom-
mended setting for driving a Dolby Digital encoder.
The 6300 can also truncate its output word length to 20, 18, 16 or 14 bits.
The 6300 can add dither (see the next step).
H) Adjust DO1 D (dither) to I
ITH
[In] or [Out]
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
ORD
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
I) Set DO1 F
as appropriate for your transmission system.
RMT
correctly on the 6300, you can
IALNORM
> D C > DO1 C
ALIB IGITAL ALIB
LAT .
or O
N UT , as desired.
L
control. This first-order noise shaped dither consid-
EN
ORBAN MODEL 6300
.
ALIB
ORD (word length).
.
N