||audio / video
||Audio Video Interleave - An audio-video
standard designed by Microsoft.
||auto electronic shutter - the ability of
the camera to compensate for moderate light changes in indoor applications
without the use of auto iris lenses.
||back light compensation - a feature on
newer CCD cameras which electronically compensates for high background
lighting to give detail which would normally be silhouetted.
||Category 5 (cable) - the type of cable
that is used in networking applications.
||CCTV security cameras produce images using
CMOS or CCD (Charge Couple Device) chips. CCD chips are higher quality and
produce a better image than CMOS.
||complementary metal oxide semiconductor -
Pronounced see-moss, CMOS is a widely used type of semiconductor.
||digital video recorder - a digital video
recorder is basically a computer that converts the incoming (analog)
signal from the cameras to digital, and compresses it, and stores it. The
DVR replaces the function of a multiplexor (or quad or switcher) and a
security VCR. There are many advantages of digital video recorders over
their analog counterparts.
||frames per second - in digital video
applications, refers to the number of video images that can be captured,
displayed, or recorded in a second. Also referred to as the 'frame rate'
or 'refresh rate'.
|JPEG (or JPG)
||Pronounced "jay-peg" and stands for "Joint
Photographic Experts Group" who designed the standard. This is a standard
way of compressing images which works particularily well for photographic
images (as opposed to graphic art).
|MPEG (or MPG)
||Pronounced "em-peg" and stands for "Motion
Picture Experts Group" who designed the standard. This is a standard way
of compressing audio and video files. (It's also the technology behind the
now world-famous MP3 music files.)
||power over ethernet - an adaptor that
allows you to transmit power to a security camera through CAT5 (aka
||pan-tilt-zoom - PTZ cameras allow you to
adjust the position ('pan' is side-to-side, 'tilt' is up-and-down) and
focus ('zoom') of the camera using a remote controller. Due to this added
functionality, these cameras tend to cost much more than non-PTZ cameras
||An RG-59 is a common coax cable used in
||signal to noise ratio; this number
represents how much signal noise the camera can tolerate and still provide
a good picture. The higher the number the better.
||Videocassette recorder; an electronic
device for recording and playing back video images and sound on a