Term	Definition	Demo
Gain	AUDIO: The difference in amplitude between the input to a device, and the output. The amount of amplification applied to a signal. VIDEO: the difference between the brightness of an image projected on a screen, and the brightness of the reflected light. Screens can have gains greater or less than one. The amount of gain is related to the uniformity of brightness as viewers move away from the direct axis. High-gain screens tend to be more directional. The color of the screen material is another factor.
Graphic Equalizer	An equalizer consisting of several identical percentage-bandwidth (e.g. fractional octave) filters covering the audio frequency range or portion thereof. For example: 30 one-third-octave filters would cover the frequency range from 20 Hz to 20 kHz. See: Parametric Equalizer.
Gray Scale	A measure of how well a video display tracks the shades of gray between perfect black and white. It is an assessment of the quality of the high resolution black and white picture that underlies the lower resolution color information.
Ground	An electrical connection to the earth, or a conductor or chassis serving as a common reference.
Ground Loop	When multiple ground connections are made at separated points in an electrical system there is the possibility of voltages existing between the connecting points. The common result is hum and/or noises introduced into the audio signal. See: Balanced Connections, Unbalanced Connections.