Read
out time:
is the time taken to read the charge
from the pixels in a CCD chip. Real
time video:
is a picture with more than 24
frames per sec and therefore looks continuous.
Receiver
driver:
is a part of the matrix switcher
placed at the camera point and connected
to the main switcher by a twisted pair
cable. It is used to decode the incoming
control signals for the Pan Tilt Zoom
functions.
Reed
switch:
is a type of alarm activated
when the contact is opened or closed .
It is widely used with doors, windows,
roller shutters etc. and can also activate
a switcher to bring the nominated camera
up for extended viewing.
Regulated
power supply:
is a type of DC power supply
in which the ripple factor is minimal.
Remote
head camera:
is a type of camera in which
the CCD chip is separated from the camera
body by cable. It is used in applications
where the amount of space is limited.
Resolution:
is a measure of picture definition
and clarity and is represented by number
of lines. Greater the number of lines,
higher the resolution.
RG-11:
is a type of coaxial cable with
a thicker centre core and used for transmission
of video signals up to 550m.
RG-59:
is a type of coaxial cable used
for transmission of video signals up to
230m. It is the most popular cable used
in CCTV.
Ripple
factor:
is the amplitude variation present
in a DC power supply due to insufficient
filtering . A large variation can damage
a DC camera.
RS-232:
is a communication protocol used
for communication between microprocessor
based devices. |
