Terminology Compilation

Vari-Focal

This refers to a type of lens that has the facility to change the focal length. This allows adjustment of the magnification and field of view of the camera.

Videocassette Recorder (VCR)

A device that accepts signals from a video camera / microphone and records video/audio on magnetic tape in a cassette. The VCR can play back recorded video/audio on a television set or CCTV monitor.

Video Switcher

Switcher or Sequential Switcher. A device that allows the video signals from multiple cameras to be displayed on a monitor, or recorded on a VCR one at a time in sequence.

Video Server

This is a device that accepts inputs from CCTV cameras using the PAL, composite video signal. It digitizes the signal and then transmits images via a network, dialup or GSM connection. Advanced video servers have built-in video motion detection, and can buffer images while they are being uploaded to a remote server, where they are recorded.


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