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The Diverse multi channel video switch card plugs
directly into a PC and enables switching between the
channels connected, providing a single video output that can
be taken to a single display. Up to 16 input channels can be
multiplexed to a single video output.
The sync pulses of each selected video channel are monitored
and their status relayed to the PC. This allows either
intelligent switching to skip unused channels, or alarms to
be triggered if a camera fails or is disconnected.
Software for the system is available to select the channels,
sequence a pre-defined list of channels or scan all possible
channels. The video capture option will take the selected
channel directly into PC memory and compare it with the
previous picture captured from that channel, only channels
where changes are happening are displayed. The speed of this
is about 1-2 seconds per frame on a fast PC, about a 30
second sequence with 16 cameras.
The multiplexer is a series of high quality video switches
routing the video signal from the chosen channel to the
output channel. The switches are supplied as semiconductor
switches in the standard unit. For broadcast standard video,
where noise, isolation and crosstalk are premium parameters,
there is a relay based version. This has slower selection
speed but provides a high quality of switch.
Video sources are normally assumed to be CCIR. However, NTSC
and other video standards can be accommodated, with special
versions for the data acquisition system.
The system suits a variety of video selection
- Security and surveillance
- Broadcast monitoring
- Machine vision