All moving objects generate sound when they move, unless you're in a vacuum. When any person moves inside a security zone they are disturbing the air and creating sound waves. These sound waves may be undetectable to the human ear but never the less they
Digital Video Recorders (DVR) and Video Tape Recorders (VTR) play an important role in the CCTV system. They can severely limit the picture resolution of the system. Many DVR manufactures do not specify the lines of resolution or bandwidth for the play back of the
You have a CCTV system that has good pictures some of the time but at a certain time of the day the pictures look bad either by turning dark or having bars on them. Or the picture just goes away and the DVR shows no
The Vertical Interval (V.I.) is the part of the video signal that tells the monitor to start drawing a new screen. It is made up of special SYNCHRONIZATION pulses with no picture elements. This part of the video allows special command and control signals to
Criminals will quite often enter a building by breaking through a wall or ceiling effectively by-passing the perimeter security entirely. Care must be taken to provide detection measures that do not rely on perimeter protection alone.
Hearing and speech are one of mankind's most powerful tools. We rely heavily on the use of these faculties for our day-to-day living. Yet in the average security installation this audio information is not available to security personnel responsible for the safety and security of
Ghosts and Ringing become more evident as the length of the coaxial cable becomes greater. The ringing effect (where a white-to-black or black-to-white transition in the picture is repeated many times in close succession) occurs with short cable runs of 50 to 200 feet. Obvious