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Analogue, Digital & IP Technologies Print
September 2008

Analogue is the oldest technology of the 3 whereas digital is more recent and IP is the latest as of 2008.  Analogue CCTV refers to use of camera, monitor and recorder which operate on analogue technology where the magnitude is represented by a continuous physical state or event (such as the position of a rotating arm to represent the hour of the day) as against digital where magnitude is represented by bits of a computer that are discrete and increment one by one (such as the number 17 for 5pm on a digital clock).

Without doubt, digital is more accurate or precise than analogue.  A digital camera, for example, produces a bit map for representing a video image.  However, a low resolution digital camera may produce lower quality images than a high resolution analogue camera (see CIF, D1 and Mega-pixel).

IP refers to the use of the Internet Protocol for transmission of video images on the Internet and local area networks (LAN).  It requires the camera and monitoring device to be compatible with IP.