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 system may be employed which, by operator manual control, switches the
output of two to four cameras between one monitor. For systems of four
cameras or more, an automated switcher is generally employed. The various
features which a sequential switcher may incorporate are defined in Table
13.
6.2.4.7 Switchers Features. The homing option automatically advances the
picture on a single monitor at a predetermined interval, selectible from one
to 45 seconds. Bridging permits two outputs, one for sequential viewing of
all cameras as in a homing switcher and the second for continuous viewing of
a selected camera. Looping allows the inputs on a switcher to be fed to
another device such as a VTR, monitor, switcher, etc. Automatic or
alarm-programmed assures that the scene of a sensor zone in alarm will be
displayed as an override to any other display. Figures 35 through 38
display the control switch positions for operating homing, bridging, and
looping switcher options as stand-alone options for a simple CCTV system, as
well as the common looping/bridging combination (Figure 38). The alarm
option would naturally assure automated alarm zone viewing of the camera
scene(s) by the appropriate monitor(s). The combination illustrated in
Figure 38 could also have provided for output to a VTR rather than a second
monitor location. Table 14 provides a guide for switcher option selection
and system integration general guidelines. For most Navy applications, use
of a video switcher is the most cost-effective and ergonomic-dictated
approach. Use of one which incorporates bridging and auto-alarm options is
probably the most common approach to both assure automatic alarm assessment
and permit operator scene selection for surveillance or assessment of
adjacent zones to the alarmed zone. Use of a VTR will require incorporation
of the looping option. Using Table 14 as a
Table 13
Sequential Switcher Definitions
DEFINITIONS
THE FEATURES AVAILABLE FOR A SEQUENTIAL SWITCHER ARE DEFINED
BELOW:
HOMING: A TYPE OF SEQUENTIAL SWITCHER WHICH ALLOWS
CONTINUOUS VIEWING OF ANY NORMALLY SEQUENCED CAMERA
INPUT ON A SINGLE MONITOR.
BRIDGING: A FEATURE WHICH PERMITS A SEQUENTIAL SWITCHER
TO CONTINUOUSLY DISPLAY ONE CAMERA INPUT ON A SECOND
MONITOR.
LOOPING: A VIDEO OUTPUT CONNECTOR IS PROVIDED FOR EVERY
CAMERA INPUT TO ALLOW THE VIDEO FROM ANY CAMERA TO BE
FED TO ANOTHER SWITCHER OR ANOTHER DEVICE.
ALARM PROGRAMMED: THE AUTOMATIC SWITCHING OF A SEQUENCED
CAMERA INPUT ONTO A MONITOR UPON CLOSURE OF
AN EXTERNAL ALARM SWITCH.
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