MAC
MATRIX SWITCHING
MATV
MEASUREMENT OF AUDIO LEVEL
MESECAM
MICROPHONE AMPLIFICATION
MICROPHONE IMPEDANCE
MICROPHONE SIGNAL
MII
MJPEG
MOIRE
MORPHING
MPEG-1
MPEG-2
MPEG-4
MPEG-7
MTBF
MULTIBURST
MULTIDISTRIBUTION
MULTIMEDIA
MULTIPLEXER (MUX)
MULTISCAN MONITOR
MAC
Multiplexed Analog Component video. This system uses a single coax cable or any other single link for transmission of component video. Digital time-compression is usually needed to perform this operation.
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MATRIX SWITCHING
An audio-video-graphics matrix switcher is a device which resembles a telephone switchboard. It is an array of electronic switches which routes a number of signals to one or more outputs. A matrix switcher usually has several inputs which can be directed by the user, in any combination, to various output devices connected to the switchers. Monitors, Plasma screens, projectors, VCRs and other output devices can be connected. The user can direct source number 1 to acceptor number 2 while simultaneously connecting source number 8 to acceptors number 1, 3 and 4. The possibilities are almost endless.
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MATV
Master Antenna TV. The classic TV broadcasting system where antennas are used for transmitting and receiving TV programs.
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MEASUREMENT OF AUDIO LEVEL
In the recording process, audio level is a critical factor. If is too high, audio distortion occurs. If it is too low, the signal-to-noise ratio deteriorates. Thus precise measurement of audio level is essential during recording. A mechanical VU-meter or an electronic LED bar graph meter measures audio level. One of the most effective and fastest methods employs LEDs which change color according to signal level. When the audio level is too high or too low the lamp changes from green to red signaling that a problem has arisen.
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MESECAM
Middle East SECAM. A modified SECAM standard (B, G, D, and K) used in several countries in the Middle East.
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MICROPHONE AMPLIFICATION
A microphone is a device which converts sound waves to electrical impulses. High quality microphones usually generate a very low signal level. Low noise, high fidelity pre-amplification is required to boost the output of a microphone before the signal reaches the main audio amplifier where it is processed as a regular audio signal. Pre-amplifying low level microphone signals may be achieved by precise matching of microphone impedance and use of low noise electronic amplifying devices. Some microphones (mainly condenser type) need DC power in order to operate (phantom voltage) even before connecting to the amplification circuitry.
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MICROPHONE IMPEDANCE
In order to obtain the highest quality output signal from a microphone, its internal impedance should be matched to that of a pre-amplifier with exactly the same input impedance. Microphone impedance may vary from a few ohms to several megaohms.
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MICROPHONE SIGNAL
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MII
A professional video format, utilizing a 1/2-inch metal particle videotape, using component video for recording and playback. The system is being further upgraded to use digital video signals.
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MJPEG
Motion JPEG. Each frame/field is compressed to JPEG standards, and the sequence is displayed by sequencing through the JPEG frames. This system provides the best video quality, with little or no artifacts, but needs very fast processing.
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MOIRE
(рус. Муар)
A video artifact appearing on the screen as close, jittering color lines. This effect is created in the analog video world where high frequency luminance information creates color beats due to insufficient luminance filtering and shortcomings of the monitor. The TV color decoder mistakenly interprets the high frequency signals as chrominance information and creates unwanted color fringes. In the digital world this effect arises due to incorrect sampling rate.
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MORPHING
(рус. Морфинг)
A digital special effect carried out between two or more images, where the images are merged and transformed, one into the other. The images may be human faces or any other objects. The effect is widely used in video and in the movies, and requires much processing power.
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MPEG-1
(рус. Морфинг)
A system for coding moving pictures and sound developed by the Motion Picture Experts Group. The data rates are 1.5 Mbits/sec. Layer II audio is a subset of this system. MPEG-1 is used for CD audio and video.
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MPEG-2
(рус. Морфинг)
A collection of definitions for digital audio and video compression used in digital video and audio transmission and play back. Definitions of this standard are used for the DTV and DVD formats, and were developed by the Motion Picture Experts Group.
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MPEG-4
(рус. Морфинг)
Content-based standard developed by the Motion Picture Experts Group, aimed at multimedia applications. The compression algorithms for MPEG-4 are more efficient than those used in MPEG-2.
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MPEG-7
(рус. Морфинг)
A content representation standard developed by the Motion Picture Experts Group for visual and scene motion recognition, for information search purposes.
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MTBF
(рус. Морфинг)
Mean Time Between Failures. A term used to measure long time reliability of a machine or media. The higher the number (usually measured in hours of operation), the smaller the chance of failure in a given time period.
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MULTIBURST
A video test signal composed of sinusoidal bursts of increasing frequencies, mainly used for frequency response testing and alignment of video equipment.
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MULTIDISTRIBUTION
Simultaneous duplication of one signal source to many tapes. In the analog video world - during multi-distribution - a video processor can be connected between the video source and the distribution amplifier to enhance the copies or the monitor images
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MULTIMEDIA
Hardware and software that merge video, computer graphics and multi-channel sound in one interactive session. Multimedia can simultaneously display several live video scenes in small windows on one computer screen, and control the position and shape of the windows using a computer mouse and keyboard. Retrieval of music and other audio signals and of video scenes recorded on a computer hard disk, for educational, presentation and production purposes are only some of the applications made possible by multimedia, which creates a single computer-video-audio entertainment center. Nowadays the name is linked to everything related to graphics/video and audio production and entertainment.
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MULTIPLEXER (MUX)
A device for combining several signals into a single composite signal, used extensively nowadays in the digital video/audio environment.
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MULTISCAN MONITOR
A monitor (mainly for computer use) which synchronizes on different sync frequencies, allowing the use of different graphics formats on a single monitor, provided the graphics card used is able to do so. Multiscan monitors (sometimes called Multisync or Multifrequency monitors) are able to cope with many different graphics formats, and thus became the preferred choice of most PC users. Digital LCD monitors, can operate in many different sync frequencies, but the best image is obtained at a specific resolution and scan rate, known as its \''native resolution\''.
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