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MECHANICAL FOCUS
Focusing of a camera lens or pick-up device
by mechanical means.
MONOCHROME
Black and white picture comprising of a
number of levels of grey scales.
MULTIPLEX
Method of transmitting or recording many
video signals at the same time.
ND
Neutral Density. Filter which is positioned on
the rear of the lens, enabling the camera to
operate in difficult lighting conditions, by
widening its operating parameters.
PEAK TO PEAK
Value between the maximum positive and
negative points on a waveform.
PIXEL
A word derived from Picture Element.This is
the smallest unique point of digital video
image. In digital video,a picture is divided up
into thousands of Pixels, each specified by
luminance, chrominance and position
information.
REAL ACTION RECORDING
High density VCR recording which provides
three times as many fields as conventional
time-lapse VCRs.
RESOLUTION
The definition of a TV picture in terms of the
finest detail that can be recorded and played
back.
RS232/485
Serial Interface commonly used to commu-
nicate between different control equipment.
SMART CONTROL
Developed by Sony in 1994, this digital
technology allows Sony cameras to
automatically adjust iris, gain,white balance
and flicker to external lighting conditions.
SEQUENCE SWITCHER
A switcher that displays camera pictures in a
set order and dwell time, predetermined by
the user.
SPECTRAL RESPONSE
This is the response of the light sensing
(charge coupled) device to different
wavelengths of light.Typically between the
ultra violet and infra-red spectrum.
SYNC GENERATOR
Device that produces a synchronisation signal.
SUPER-VHS
VCR recording system that enables recording
of 400 TV lines horizontal resolution as
compared with ordinary VHS of 240 TV lines.
TELEMETRY
Electronic method of controlling functions,
such as pan, tilt,zoom, focus,generally via
coaxial cable or a twisted pair of fibre optic.
TIME LAPSE
Video cassette recorder which allows the
compression of real time recordings onto tape
using time lapse mode. Can be up to 960
hours onto a single hour tape.
TRINITRON CRT
Cathode Ray Tube which is completely flat in
the vertical plane to enable better monitor
image geometry.
TRIPLE MULTIPLEX
A transmission of video, sync and DC power
over a single coaxial cable.
VERTICAL PHASE
Feature on some AC cameras to adjust line
lock and synchronise multi-camera system.
VHS
Video Home System domestic video recorder
format giving 240 TV lines horizontal resolution.
WATERMARKING
Technical method of ensuring the integrity of
images recorded digitally.
WHITE BALANCE
Term which only applies to colour cameras.
Where white is the reference to determine all
other colours in the visible spectrum.
Y/C
Method of separating and transmitting video
signals divided into Chrominance C (colour)
and Luminance Y (brightness) for higher
resolution and quality. Usually employed
between multiplexer/recorder/monitor.
ZOOM RATIO
Term where the lens has moveable elements.
For example it is generally defined as 6:1 or
10:1 (i.e. 12.5 – 75mm or 10 – 100mm)
34
The Sony Guide to CCTV
.
Issue 3
Basic CCTV Terminology