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BKSTS Illustrated Dictionary of Moving Image Technology, 4th Edition by Martin Uren

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Q

Q-Factor: A measure of the efficiency of a resonator or resonant circuit. High Q values represent a narrow width of resonance. Also called magnification factor.

Q-signal: In the NTSC colour system, represents a colour difference signal on the green-magenta axis (compare the I-signal).

Quad: Abbreviation for Quadruplex. (Hist.)

quad-in-line (QIL): A type of integrated circuit package with the contact pins in two pairs of offset staggered rows for mounting through holes in a circuit board (1).

quadraphony: A four channel sound system which allows the reproduction of left-right and front-back sound distribution to a listener. (Hist.)

quadrature: A 90 degree phase difference between two signals.

quadrature amplitude modulation (QAM): Digital modulation ...

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