Sony SSC-C108P Посібник - Сторінка 26

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Video Switching and Multiplexing

Multiplexers

Multiplexers are a more functionally useful way of handling a multi-camera system.

Like a switcher, several cameras (usually up to 16) can be connected to the

multiplexer. A single field or frame from each camera is successively output via the

multiplexer onto a video recording. Playback would take place again via the

multiplexer which would decode the recording to the monitor.

So, for example, if four cameras were connected to the multiplexer, on playback,

the particular camera to be reviewed would be selected and an updated image

produced every 0.87 seconds (Sony YS-DX316P and SVT-5050P). The more

cameras that are recorded onto one tape, the fewer images per camera are

captured – if eight cameras were connected, that refresh rate would extend to one

image every 1.73 seconds.

In the majority of cases, these types of refresh rates provide sufficient

information to enable incidents to be reviewed effectively. Problems may arise if the

video recorder is a time-lapse machine recording many cameras over long periods.

For example, if 16 cameras were recorded over 72 hours you would have to wait

9.87 seconds for the image from each camera to be updated. It is therefore

important to ensure that an acceptable ratio of cameras to multiplexers/VCRs is

utilised.

Duplex multiplexers can display in multi-picture mode at the same time as

recording, as above. Simplex multiplexers can either record or display, but cannot

do both simultaneously.

The Sony Guide to CCTV . Issue 3