Orban OPTIMOD 8685 - Page 91

OPTIMOD SURROUND PROCESSOR INSTALLATION
2-37
21. Program Silence Sense (optional)
You can program each processing chain (surround and 2.0) in the 8685 to switch
automatically from its primary digital input to a backup input if the signal at the
primary digital input falls silent.
There are silence detectors for each physical input channel. The silence
sense parameters apply to all silence detectors. All detectors are available
to drive the 8685’s tally outputs. (See step (22.B) on page 2-38.)
In the surround processing chain, silence sense will be triggered only
if all
hardware channels assigned to the surround processing fall silent.
In the 2.0 chain, silence sense will be triggered if either logical input
channel assigned to the 2.0 processing falls silent, thereby protecting
against “loss-of-one-stereo-channel” faults. (Each hardware AES3id input
carries two “logical input channels.”)
A) LOCATE to INPUT/OUTPUT > SILENCE.
B) Set the S
ILENCE THRESHOLD to the level below which the 8685 will interpret
the input as being silent.
C) Set the S
ILENCE DELAY to the amount of time that the input must be below
the S
ILENCE THRESHOLD before the 8685 automatically switches to the backup
input.
D) Set M
ULTICHANNEL INPUT FALLBACK to YES if you wish the 8685 to automatically
switch the surround processing’s Lf/ Rf input from its assigned hardware input
to a fallback input when silence on all surround channels is detected or an
AES receiver unlock error on the input assigned to Lf/Rf is detected. (Channels
LFE, Lb, Rb, Ls, and Rs will be muted.) Set the control to N
O to defeat auto-
matic switching.
If audio is restored at the input assigned to Lf/Rf, the 8685 will automati-
cally reconnect the Lf and Rf channels to this input and unmute the re-
maining channels.
E) Set MULTICHANNEL FB SOURCE to the hardware input that will drive the Lf and
Rf channels if silence or an AES receiver unlock error on the normal Rf/Lf input
is detected and S
URROUND INPUT FALLBACK = YES. The choices depend on
whether the 8685 is equipped with the optional HD-SDI module.
F) Set the 2.0
FALLBACK to YES if you wish the 8685 to automatically switch the
2.0 processing from the hardware input normally assigned to the 2.0 process-
ing to a fallback input when silence on either channel or an AES receiver
unlock error is detected on the normal input channel. Set the control to N
O to
defeat automatic switching.
G) Set 2.0
FB SOURCE to the hardware input that will drive the 2.0 processing if
silence or an AES receiver unlock error is detected and 2.0
FALLBACK = YES. The
choices depend on whether the 8685 is equipped with the optional HD-SDI
module.
22. Program Tally Outputs.
[Skip this step if you do not wish to use the tally outputs.]