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G.xxx
These are standards set by the ITU-T governing the transmission of audio.
G.711 An ITU-T Recommendation detailing a 32- to 64-Kbps 3.4-KHz bandwidth audio coding algorithm. Part of the ITU-T codec and telephony requirements. This algorithm produces telephone grade audio, especially useful in videoconferencing at aggregate bit rates above 128 Kbps.
G.722 An ITU-T Recommendation detailing a 64-Kbps 7-KHz bandwidth audio coding algorithm. Part of the ITU-T codec requirements. This produces good quality audio but is generally not recommended at aggregate bit rates below 256 Kbps.
G.723 An ITU-T Recommendation; Dual Rate Speech Coder for Multimedia Communications Transmitting at 5.3 and 6.3 Kbps.
G.728 An ITU-T Recommendation detailing a 16-Kbps 3.4 KHz bandwidth audio coding algorithm. Part of the ITU-T codec recommendations. Produces good speech intelligibility and is a good choice for operation at 112 or 128 Kbps transmission.
Green (G).
The green video signal, part of an RGB component video signal. G may also include synchronization information.

Genlock
The synchronization of a piece of video equipment by means of an external video signal. In videoconferencing systems, all cameras should be genlocked together.

Ghosting
A motion artifact in monitor displays of compressed video images. As an image moves quickly across the field of view (e.g., an arm waving) it leaves a trail of 'ghost' images that resolve as the movement stops.

Grabber
This is the expansion card that will take the signal passed to it from an external video source and convert it into digital video. If you use a digital camera produced for DVC, you often will not need a video grabber card.

Graphical User Interface (GUI)
An application, such as Microsoft Windows, that lies on top of other applications and provides a user interface based on graphical icons.

Graphic equalizer
Allows user to accentuate or de-emphasize selected frequencies within an audio sample. An example is the different 'tuning' for heart and lung sounds in electronic stethoscopes.

Graphics stand
Document stand. Typically used for capturing and transmitting images of documents. Can be used for skin lesions and the like. Typically uses a 1-CCD (1-chip) camera. At a minimum, a graphic camera should have color and black and white modes, manual iris, zoom, focus, and color adjustments, additional overhead lights for uniform illumination, and a large (at least 8.5 x 11 inch) back-lighted base. The last feature is useful for capturing images of transparencies and X-ray, CT, and MRI images.

Gray scale
The levels (shades) of gray that a screen or pixel within a screen can display. See bit depth.

Group system
A videoconferencing system designed for a small group of people and consists of a pan, zoom, tilt camera, large 20" SVGA monitor, echo cancellation and automatic gain audio.

Group videoconferencing system
A relatively large videoconferencing system that links groups of people located at remote sites.



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