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Dictionary of Technical Terms - M
MASTER Interactive Distance Learning System
A fully interactive teaching and conferencing system for multiple schools and classrooms made by Grass Valley. A Grass Valley Group master control switcher. The switching link for video and audio sources used between a television facility and a transmitting device.master reference synchronizing pulse generator (master SPG)
A synchronizing pulse generator that is the precision reference for an entire teleproduction facility. Grass Valley Group interactive distance learning system that uses a variety of telecommunications equipment. The main sync pulse generator used as the reference for any number of slave generators. A facility should have only one active master sync generator to feed synchronizing signals around the facility. 1. In editing, the process in which one or more VTRs (slaves) are controlled by another VTR (master). 2. In sync generators, the process in which several sync generators (slaves) are controlled by one main sync generator (master). In editing, a command that calculates the match frame for the time specified in the R-VTR's mark table IN column. An edit in which a scene already recorded on the master is continued with no apparent interruption. A characteristic of fiber optic transmission in which the velocity of light through a glass fiber varies with wavelength of the transmitted signal. Material dispersion can impair the bandwidth, information carrying, and distance capability of the system. Plural of matrix. A logical network configured in a rectangular array of intersections of input-output leads. In routing switchers, a signal switching frame configured such that any frame input may be selected at any frame output. In a color television set or an encoded chroma keyer, the section that combines the luminance and color signals and transforms them into individual red, green, and blue signals. In the TV set, these signals are then applied to the picture-tube grids. In the encoded chroma keyer, these signals are used to generate a chroma key. A solid color signal that may be adjusted for chrominance, hue, and luminance. Matte is used to fill areas of keys and borders. A solid color created from a matte generator and used as a background for a key. In video switchers, the ability to copy the settings of one matte generator to another. Matte video used to fill the hole in a key effect. A video generator that produces a solid-color output which can be adjusted for hue, chroma and luminance. A key effect in which the inserted fill video is created by a matte generator. Medium access unit. A device for connecting equipment to an ethernet network. Megabits per second. Digital transmission speed in millions of bits per second. A fiber optic multichannel digitized video and audio transport system made by Grass Valley. Mix/effects. Unit of measure of length. One meter equals 3.28 feet or 39.37 inches. A printed circuit board that mounts on top of another printing circuit board to form a sandwich or stack. Sometimes called a submodule or daughterboard. One million bytes (actually 220 or 1,048,576); one thousand kilobytes. One million Hertz. One million ohms. One million watts. Modification of final judgement. One one-millionth (0.000001) One millionth of an ampere (0.000001 ampere). An IC package incorporating logic, memory, control, computer and/or interface circuits. One millionth of a second (0.000001 second). One millionth of a volt (0.000001 volt). One millionth of a watt (0.000001 watt). A term applied to waves in the frequency range of 1000 megahertz and upward. A DC-free channel coding scheme used in D2 VTRs. One one-thousandth (1/1000). One thousandth of a meter (0.001 meter). There are 25.4 mm per inch. One thousandth of a second (0.001 second). One thousandth of a volt (0.001 volt). One thousandth of a watt (0.001 watt). A transition between two video signals in which one signal is faded down as the other is faded up. A subsystem of a video production switcher where a composite of two or more images can be created. Each M/E typically includes crosspoint buses, keyer(s), and mixer. 1. European term for production switcher. Complete term is vision mixer. 2. A circuit which can mix two or more video signals. 3. An audio console for combining audio sources. Man-machine language. A programming language that allows a user direct programming access to machine functions. See intermodal dispersion. A device that transforms a typical two-level computer signal into a form suitable for transmission over a telephone line. Also does the reverse-transforms an encoded signal on a telephone line into a two-level computer signal. Modem is an acronym for modulator/demodulator. A circuit that modifies a carrier wave by amplitude, phase, and/or frequency. A printed circuit board or assembly that contains electronic components and slides into a cell. See extender board. In video, a wavy pattern that appears as an artifact in the picture. Caused by two high frequency signals in the picture that mix together to create a visible low frequency beat pattern. 1. In video, a device that directly displays a video picture from a camera, videotape recorder, or special-effects generator. 2. A verb meaning to watch or listen to a signal. See monochrome. Black and white video. A video signal that represents the brightness values (luminance) in the picture, but not the color values (chrominance). 1. A single slice of silicon substrate on which an integrated circuit is built. 2. Elements or circuits formed within a single semiconductor substance. In digital picture manipulators, a recursive effect that develops over time. A composite picture made up of several different key frame pictures. See multifreeze.
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