Video Electronics Standards Association. VESA has issued a number of standards, mostly relating to the function of video peripherals in PC computers.
Victor Home System; used by most VCRs as the recording medium.
Video Band :
The frequency band used to transmit a composite video signal.
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.
Varifocal Lens :
A cctv camera lens whose focal length / viewing angle can be manually adjusted to suit the camera view required.Typical Vari Focal lens lengths are: 2.5mm-10mm, 3.5mm-8mm, 5mm-50mm
Video Splitter :
CCTV device that splits the video signal from a camera (or cameras) so it can be used more than once.
Vertical Interval Switching :
The seamless switch between two cameras, no time is elapsed.
Identifying an individual based on some type of provided information. Verification may be done using by methods such as access cards, biometric information, PIN, etc.
Voice Recognition System :
An access control system that verifies a person's identity by comparing previously stored voice recordings key words or phrases with the same key words or phrases spoken at the time access is requested.