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 ...