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视音频专业术语表

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视音频专业术语表(7)

2017-02-13 09:15 admin 人关注

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

G
Gain - (1) A general term for an increase in signal power or voltage produced by an amplifier. The amount of gain is usually expressed in decibels above a reference level. Opposite of attenuation. (2) The amplification of a signal, unit, or system. Expressed in the unit of measurement appropriate to the signal or system. (3) In fiber optics applications, the measurement of back reflections using an OTDR - Optical Time Domain Reflectometer, due to a mismatch in core sizes between adjoining optical fibers.
Gainer - In fiber optics applications, a backscatter measurement condition with an OTDR that indicates a splice loss, due to a mismatch in core size between the two optical fibers. The resulting trace indicates a perceived increase in power, and is therefore known as a “gainer.”
Gamma - The light output of a CRT is not linear with respect to the voltage input. The difference between what you should have and what is actually output is known as gamma.
Gamma correction - Before being displayed, the linear RGB data must be processed (gamma corrected) to compensate for the gamma of the display.
Gang - Refers to the number of wiring devices that can be installed in an electrical box, (e.g., “two gang” refers to a box that can accommodate two duplex receptacles, “three gang” refers to a box that can accommodate three duplex receptacles, etc).
Gateway - A network node equipped for interfacing with another network that uses different protocols. Also can be described as an entrance and exit into a communications network.
Genlock - A technique where the video output of one source, or a specific reference signal, is used to synchronize other television picture sources together. Video sources which are genlocked have vertical sync pulses which are synchronized together.
Ghost - Also called “ghosting,” or “reflections.” A shadowy or weak duplication of the original image. It can be the result of transmission conditions where secondary signals are created and then displayed earlier or later than the original signal. Ghosts can also be the result of burning an image on a screen or by a mirror.
GHz - Gigahertz. One billion cycles per second.
Giga - The prefix abbreviation for billion. (G) One G-Byte = 1 billion bytes.
Global presets - The Extron matrix switcher output configuration settings that can affect all output connections/ties and can be saved/recalled by simply pressing a button or issuing a Simple Instruction Set (SIS™) command.
GOP - Group of successive pictures within a coded video stream. MPEG, MPEG-2 and MPEG-4 compression products apply a GOP structure to their video compression systems. Each coded video stream consists of successive GOPs. From the pictures contained in it, the visible frames are generated. A GOP begins with an I-frame containing the full temporal resolution of the video frame. A series of predictive information is calculated between I –frames. P-frames are predictive and estimate forward, B-frames apply bi-directional prediction and estimate forwards and backwards. Products will apply GOP structures in different manners to support the needs of different applications be it: low delay, low bit rate or error resilience.
Graded index fiber - An optical fiber in which the index of refraction within the core of a multimode fiber decreases with the radius from the fiber axis. The index of refraction usually follows a parabolic profile from the fiber axis to the cladding, effectively addressing modal dispersion throughout the fiber link.
Graded Index Plastic Optical Fiber – GI-POF - A plastic multimode optical fiber with an index of refraction within the core that decreases from the fiber axis to the cladding. The index of refraction usually follows a parabolic profile from the fiber axis to the cladding, effectively addressing modal dispersion throughout the fiber link.
Graphic equalizer - An active electronic device which allows the adjustment of narrow ‘bands’ of audio frequencies to correct for recording and listening room deficiencies. Graphic equalizers generally have sliding levers, known as faders, representing the different ranges of frequencies between 20 and 20,000 Hz. (See EQ-Audio)
Ground - Electrical connection of a circuit to a point designated as having zero potential.
Ground loop - A potential system grounding problem that may produce symptoms that appear as sync noise and cause a horizontal bar (hum bar) to roll vertically on the video image. A ground loop occurs when some devices in a system are not connected to the same electrical ground as the other devices. This can create a voltage potential difference between ground on the pieces of equipment.
Group delay - The amount of delay or rate of phase shift with respect to frequency though a device or cable.
GVIF - Gigabit Video Interface. A transmission and connectivity standard developed by Sony that is used for digital video connections on the Sony VAIO desktop computer systems and Sony laptop PCs.
 

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