Orban OPTIMOD-FM 8700, Руководство по эксплуатации

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2-34
INSTALLATION ORBAN MODEL 8700i
Be aware that this setting can be toggled between FM and FM+D
ELAY
by
several means in addition to the A
NALOG
O
UT
S
OURCE
control in the
I
NPUT
/
OUTPUT
> O
UTPUT
1 screen. These additional means include the
8700i’s GPI inputs (page 2-61), its serial ports (page 2-48), its Ethernet in-
put (via 8700i PC Remote or a terminal program), and its clock-based au-
tomation (page 2-42).
C) Set the A
NALOG
O
UTPUT
P
RE
/ F
LAT
control to P
RE
-
E
(for preemphasis) or F
LAT
.
[Skip this step if you will not be using the analog output.]
If you will use the analog output to drive a stereo encoder, P
RE
-
E
pro-
vides the best performance because this stereo encoder does not have to
restore the preemphasis. However, if you cannot defeat the preemphasis
in your stereo encoder or if you will use the analog output for monitor-
ing, set the output
F
LAT
.
If you are sending the analog output of the 8700i through a digital link
that uses lossy compression (like MPEG, APT-X, or Dolby), set the output
F
LAT
. Lossy codecs cannot handle pre-emphasized signals.
[Skip steps (D) through (I) if you will not be using the”AES1” digital
output. Note that both the “AES1” and “AES2” digital outputs have
identical functionality, so you could use either one in the steps below.]
D) Set the AES1 O
UT
S
OURCE
control to the desired source: FM , FM+D
ELAY
, HD , or
M
ONITOR
.
In most facilities, you will set it to FM
.
E) Set the AES1 P
RE
/F
LAT
control to P
RE
-
E
(for preemphasis), F
LAT
, or P
RE
-
E
+J17.
See the notes immediately above.
P
RE
-
E
+J17 applies both FM preemphasis and J.17 preemphasis (in cascade) to the signal
and is only used with STLs using J.17 preemphasis when their own J.17 preemphasis fil-
ters are bypassed. These are rare.
F) Set the AES1 output S
AMP
R
ATE
(sample rate).
[32], [44.1], [48], [88.2], or [96], in kHz
The 8700i’s base sample rate is always 64 kHz, but the internal sample
rate converter sets the rate at the 8700i’s digital output. This adjustment
sets the 8700i’s output sample rate to ensure compatibility with equip-
ment requiring a fixed sample rate.
G) Adjust the AES1 SR SYNC control.
[Internal / Sync In / Input]
You can lock the sample rate of each of the 8700i’s AES3 outputs to the
sample rate of a reference AES3 signal that is applied to the AES3 input
or to an AES11 signal that is applied to the SYNC input.
If you wish to operate the two AES3 outputs at different sample rates,
only one output can be synced to the signal at the SYNC input. However,
in this case the other output could be synced to the signal appearing at
the digital input.