Glossary of Audio Terminology

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Index | References




Gain the ratio of the signal output from a system to signal input to the system.

GAL® (generic array logic) Registered trademark of Lattice Semiconductor for their invention of EEPROM-based low-power programmable logic devices.

Gbps ( Gigabits per second ) A measure of bandwidth (the amount of data that can flow in a given time).  Gbps is defined as the number of bits per second ( in billions of bytes ) that can be transmitted over the specified data transmission medium. See also "giga" and gigabyte below.

GHz (Giga-Hertz per second ) abbreviated GHz, gigahertz is a unit used to measure the frequency of  alternating current (AC) or an electromagnetic (EM) wave.  It is defined as one Billion (1,000,000,000 Hz) cycles per second.

giga abbreviated G, A prefix signifying one billion (10E9).

gigabyte A billion bytes.

GIGO (garbage in garbage out) Popular acronym used by programmers to indicate that incorrect information sent to a system generally results in incorrect information received from it.

granulation noise An audible distortion resulting from quantization error.

graphic equalizer A multi-band variable equalizer using slide controls as the amplitude adjustable elements. Named for the positions of the sliders "graphing" the resulting frequency response of the equalizer. Only found on active designs. Center frequency and bandwidth are fixed for each band.

groups (aka subgroup or submix) A combination of two or more signal channels gathered together and treated as a set that can be varied in overall level from a single control or set of controls. Mixing consoles often provide a group function mode, where the level of any group of incoming singles may be adjusted by a single slide fader, which is designated as the group fader. Likewise in certain signal processing equipment with splitting and routing capablities, you will have the ability to group together, or assign, outputs allowing control of the overall level by a single external controller.

group delay The rate of change of phase shift with respect to frequency (mathematically, the first derivative of phase verses frequency). The rate of change is just a measure of the slope of the phase shift verses linear (not log) frequency plot. If this plot is a straight line, it is said to have a "constant" (i.e., not changing) phase shift, or a "linear" phase shift characteristic. Hence, constant group delay, or linear group delay.

GUI (graphical user interface) A generic name for any computer interface that substitutes graphics (like buttons, arrows, switches, sliders, etc.) for characters; usually operated by a mouse or trackball. First mass use was Apple's Macintosh® computers, but is now dominated by Microsoft's Windows® programs.

gyrator filters Term used to describe a class of active filters using gyrator networks. Gyrator is the name given for RC networks that mimic inductors. A gyrator is a form of artificial inductor where an RC filter synthesizes inductive characteristics. Used to replace real inductors in filter design.



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