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MPEG4

Moving Picture Experts Group, version 4 - a form of compression.
 
Manual Iris Lens
Refers to lens with a manual adjustment to set the iris opening (aperture) to a fixed position. This type lens is generally used in fixed lighting conditions.

 Matrix Switcher
A combination or array of electromechanical or electronic switches which route a number of signal sources to one or more designations.

Maximum Recording Time indicates the longest continuous duration of time which could be recorded onto storage media using a VCR or DVR.

MHz (megahertz)
This is a measure of frequency. 1 GHz = 1000 MHz = 10,000 KHz = 100,000 Hz.

Modem
This is a network communication device for computer-type devices. A modem (from modulate and demodulate) is a device that modulates an analog carrier signal to encode digital information, and also demodulates such a carrier signal to decode the transmitted information.

Monitor
A unit of equipment that displays on the face of a picture tube the images detected and transmitted by a television camera.

Monochrome
This term refers to black and white with all shades of gray.

Milliamps (mA)
This is a measure of electrical current power consumption.

Multiplexer
Refers to a video switching device that accepts video input from multiple cameras and converts them to all display on one monitor and / or video recorder.



 
 
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