CCTV Glossary
Cascadia Video Products LLC
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MAC - Multiplexed analog components. A system in which the components are time multiplexed
into one channel using time domain techniques, i.e., the components are kept separate by being
sent at different times through the same channel. There are many different MAC formats and
standards
Manual iris - A manual method of varying the size of a lens’s aperture.
Matrix - A logical network configured in a rectangular array of intersections of input/output
channels.
Matrix switcher - A device for switching more than one camera, VCR, video printer and similar, to
more than one monitor, VCR, video printer and similar. Much more complex and more powerful
than video switchers.
MATV - Master antenna television.
MB - Megabyte. Unit of measurement for computer memory consisting of approximately one
million bytes. Actual value is 1,048,576 bytes. Kilobyte × Kilobyte = Megabyte.
MB/s - Megabytes per second. Million bytes per second or 8 million hits per second. Also
written as MBps.
Mb/s - Megabits per second. Million bits per second. Also written as Mbps.
MHz - Megahertz. One million hertz.
Microwave - One definition refers to the portion of the electromagnetic spectrum that ranges
between 300 MHz and 3000 GHz. 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 12 GHz.
MOD - Minimum object distance. Feature of a fixed or a zoom lens that indicates the closest
distance an object can be from the lens’s image plane, expressed in meters. Zoom lenses have
MOD of around 1 m, while fixed lenses usually much less, depending on 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.
Modulation - The process by which some characteristic (i.e., amplitude, phase) of one RF wave is
varied in accordance with another wave (message signal).
Moiré 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.
Monochrome - Black-and-white video. A video signal that represents the brightness values
(luminance) in the picture, but not the color values (chrominance).
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