Glossary

Glossary Of Terms (D – L) – CCTV DARK CURRENT Leakage signal from a CCD sensor in the absence of incident light. DARK NOISE Noise caused by the random (quantum) nature of the dark current. DECIBEL (DB) A logarithmic ratio between two electrical signals or values. Usually refers to power, but can also be used […]

Glossary Of Terms (A-C) – CCTV AC Alternating Current ACCESS CONTROL SYSTEM Electronic system used to allow, restrict and track the movement of people through entry/exit points in a site. This is achieved through the use of electronic individual codes, keys or cards etc, to release a locking mechanism. ACTIVITY DETECTION A feature built into