Orban OPTIMOD-FM 8600Si, Руководство по эксплуатации

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2-34
INSTALLATION ORBAN MODEL
imum 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 ex-
treme noise shaping.
If the source material has already been correctly dithered (as is true for
virtually all commercially recorded material), you may set this control to
OUT
. However, particularly if you use the Noise Reduction feature, the
processing can sometimes attenuate input dither so that it is insufficient
to dither the output correctly. In this case, you should add dither within
the 8600Si.
H) Set
D
IGITAL
F
ORMAT to AES or SPDIF.
SPDIF is the standard consumer format; AES is almost always correct in
professional facilities.
I) Set the
DO S
OURCE to
FM
,
FM+D
ELAY
, HD
or
M
ONITOR
.
See the notes in step (10.B) in page 2-31.
J) Navigate to Setup
> I/O C
ALIB
> D
IG
O
UT
2 C
ALIB
.
If you will not be using the
Ratings Encoder Loop-through feature, repeat steps (B) through (I) for DO2. If
you are using the Ratings Encoder Loop-through feature, follow the proce-
dure in step (K) below.
K) If you are using the Ratings Encoder Loop-through feature, perform the fol-
lowing steps (see
Connecting a Ratings Encoder on page 2-8):
a) Set the
DO2 O
UT
S
OURCE
control to
AGC>R
ATINGS
or
L
IMIT
>R
ATINGS
.
You cannot use DO1 for this purpose. This is the essential difference be-
tween DO1 and DO2.
b) Connect your Optimod’s
DO2
output to the AES3 input of the ratings
encoder.
c) Connect the ratings encoder’s AES3 output to your Optimod’s
AES3
ID
I
NPUT
(on the BNC)
.
Depending on whether you choose AGC
>R
ATINGS
or
L
IMIT
>R
ATINGS
, the
AES3id input is repurposed automatically to drive the input of the FM/HD
split point or your Optimod’s stereo encoder.
AGC
applies a controlled
audio level to the encoder and allows you to use one ratings encoder for
both FM and HD;
L
IMIT
applies the highest possible audio level to the rat-
ings encoder but requires two ratings encoders if you are transmitting
HD.
d) Set the
DO2
output
S
AMP
R
ATE to
48
kHz.
e) Set the
DO2
output
W
ORD
L
ENGTH to 24-bit.
•
The Ratings Encoder Loop-through mode has a standard fallback strategy:
To prevent an audio mute, your Optimod will automatically bypass the ste-
reo encoder loop-though and will drive its stereo encoder from the output
of its FM audio processing if there is no valid AES3 signal at your Optimod’s
AES3id Input. When this occurs, ratings encoding is not occurring, so warn-
ings will flash on both the Optimod’s front panel and in PC Remote (if pre-
viously connected to your Optimod). Nevertheless, we recommend moni-