Extron Electronics Audio-Video Switchers - Manual (Page 9)

Audio/Video Switchers • Installation Audio/Video Switchers • Installation
Installation, cont’d
See chapter 4, RS-232/Remote Control for definitions of the SIS
commands, details on how to install and use the control
software, and information on how to make a remote contact
closure device.
External sync connection
When the switching between inputs, the resulting image change
should be seamless, or clean. The A/V switchers can use an
external signal to synchronize switching during the vertical
interval. Without the external sync locking feature, switching
between inputs can result in a brief rolling (sync loss) or a brief
change in the picture size.
7 External Sync In connector — Connect an external sync signal
to this BNC connection for genlocking the video signal in
broadcast or other sync-critical applications.
External Sync Out connector — Connect any downstream
equipment that requires genlocking to this BNC connector to
route the external sync signal throughout the system in
broadcast or other sync-critical applications.
Figure 2-7 shows a basic external sync configuration. The Ext
Sync In connector receives a timing signal. The Ext Sync Out
connector allows the signal to be passed on to another video
device, if required.
SW6 SV A MX rear panel
To next device
or terminate
Timing source OUT
IN
Figure 2-7 —Simple external sync connection
example
Figure 2-8 shows a typical configuration in which the timing
source passes through three video cameras and a video scan
converter before connecting to the switcher. This type of video
camera is capable of synchronizing with the external timing
source for video editing applications.
SW6 SV A MX
SY NC
OU TP UT S
IN PU TS
IN PU TS
OU TP UT S
L 1 R L 2 R L 3 R L 4 R L 5 R L 6 R L A R
A
B IN OU T
L B R
Video camera Video camera Video camera
Monitor
VCR
Sync timing source
(black burst generator)
VSC 150
VGA input
R- Y/ B- Y/ Y
50 /60 H z
10 0-2 40 V 0. 3A S- VI DE O RG B
R/ R- Y
H V S G/ Y B/ B- Y RS -23 2
IN GE NL OC K
S- VI DE O
P A L OUT 75 OHM
VI DE O
MA C VG A
I
N
P
U
T
S O
U
T
P
U
T
S
Figure 2-8 — Multiple device external sync
connection example
If no external sync timing source is connected to the switcher,
switching occurs immediately.
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