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Glossary - M

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Manual Iris: Manually changing the size of a lenses aperture.
MATV: Master Antenna Television.
Microwave: One definition refers to the portion of the electromagnetic spectrum that ranges between 300MHz and 3000GHz. The other definition is when referring to the transmission media where microwave links are used. Frequencies in microwave transmission are usually between 1 GHz and 12GHz.
MOD: Minimum object distance. This is a feature of a fixed or a zoom lens which indicates the closest distance an object can be from the lenses image plane, expressed in metres. Zoom lenses have MOD of around 1m, while fixes lenses usually much less, depending upon the focal length.
Modem: This popular term is made up of two words: Modulate and Demodulate. The function of a modem is to connect a device (usually computer) via a telephone line to another device with a modem.
Moire pattern: An unwanted effect that appears in the video picture when a high frequency pattern is looked at with a CCD camera that has a pixel pattern close(but lower) to the object pattern.
MPEG: Motion Picture Experts Group. An ISO group of experts that has recommended manipulation of digital motion images. Today there are a couple of MPEG recommendations, of which most known are MPEG-1 and MPEG-2. The latter one is widely accepted for high definition digital television, as well as multimedia presentation.
Multiplex Video Recording: The condensed recording of more than one video signal on a single video tape, or hard disk drive.
Multiplex: The conecept of transmitting several signals on a single channel
Multiplexer: A device that combines a number of signals into one. Often used in CCTV to describe a device that is primarily used to multiplex several video signals into one for the purposes of recording or microwave transmission. It can also refer to a fibre optics multiplexer which combines a number of video signals into one in order to transmit all of them via a single fibre cable.

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Glossary - M