Quadrature Amplitude Modulation. A type of digital modulation technique used to carry signals in digital cable and cable modems which usually has a number before it denoting its bit density such as 64-QAM. Cable’s equivalent to 8VSB. A QAM tuner will allow you to see digital cable channels without a cable box but only those that are broadcast without restriction. A CableCARD® will add support for restricted channels.

Quadrature Phase Shift Keying. A type of digital modulation technique used to carry DBS satellite signals and can be used in combination with QAM.

A computer multimedia file format used for video and other media types developed by Apple. Closely related to MPEG-4.

QXGA is a display resolution of 2048 horizontal pixels by 1536 vertical pixels giving a total display resolution of 3,145,728 pixels. A QXGA display has 4 times the resolution of an XGA display.