Orban OPTIMOD-FM 8700, Руководство по эксплуатации

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2-40
INSTALLATION ORBAN MODEL 8700i
19. Program Silence Sense (optional)
You can program the 8700i to switch automatically from its digital input to its
analog inputs if the
I
NPUT
S
OURCE
is set to D
IGITAL
and the signal at the digital in-
put falls silent. Conversely, you can also program the 8700i to switch automatical-
ly from its analog inputs to its digital input if the
I
NPUT
S
OURCE
is set to A
NALOG
and the signal at the analog input falls silent.
There are two silence detectors, one for the analog input and one for the
digital input. The silence sense parameters apply to both simultaneously.
Both detectors are available to drive the 8700i’s tally outputs, and either
silence detector can be used to instigate automatic input switching. (See
Tally Output Programming on page 2-63.)
Silence sense will be activated if either channel falls silent, protecting
against “loss-of-one-stereo-channel” faults.
If silence is detected at both the analog and digital inputs (as in the case
of a studio operational fault), automatic switching will not occur.
When an active signal is restored to the preferred input, the 8700i will
automatically switch back to that input.
When the digital input is in the silence detect fallback state, the unit and
PC will show the input as being
D
IG
S
ILENCE
;
when the analog input is in
silence detect fallback, they will indicate A
NA
S
ILENCE
.
A) Navigate to
I
NPUT
/O
UTPUT
> S
ILENCE
D
ETECT
.
B) Set the
S
ILENCE
T
HRESHOLD
to the level below which the 8700i will interpret
the input as being silent.
This setting is with respect to the current analog reference level and digi-
tal reference level.
C) Set the
S
ILENCE
D
ELAY
to the amount of time that the input must be below
the
S
ILENCE
T
HRESHOLD
before the 8700i automatically switches to the analog
input.
D) Set the
A
NALOG
F
ALLBACK
to
Y
ES
if you wish the 8700i to automatically switch
from the digital to analog input when silence is detected. Set the control to
N
O
to defeat automatic switching.
E) Set the D
IGITAL
F
ALLBACK
to Y
ES
if you wish the 8700i to automatically switch
from the analog to digital input when silence is detected. Set the control to
N
O
to defeat automatic switching.
F) Set the D
ANTE
F
ALLBACK
to D
IGITAL
or A
NALOG
if you wish the 8700i to switch
automatically from Dante Input #1 to digital input or analog input respective-
ly when silence is detected. Set the control to
N
O
to defeat automatic switch-
ing.
20. Set the P
ILOT
R
EFERENCE
control
This control is located in the I
NPUT
/
OUTPUT
> C
OMPOSITE
screen . It determines the
phase relationship between the 19 kHz pilot reference output (see page 2-10)
and the pilot tone present in the composite output.
0 D
EG
is correct for most in-
stallations. Use 90 D
EG
only if your RDS/RBDS generator’s 19 kHz reference input