quadrature waves

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• Quadrature amplitude modulation — (QAM) (Pronounced IPA|kwa:m) is a modulation scheme which conveys data by changing ( modulating ) the amplitude of two carrier waves. These two waves, usually sinusoids, are out of phase with each other by 90° and are thus called quadrature… …   Wikipedia

• Quadrature phase — Communication signals often have the form::A(t)cdot sin [2pi ft + phi(t)] , which is called envelope and phase form.An equivalent representation, called quadrature carrier form, is::I(t)cdot sin(2pi ft) + Q(t)cdot underbrace{cos(2pi ft)}… …   Wikipedia

• quadrature amplitude modulation — noun A modulation scheme that conveys data by applying amplitude modulation to two carrier waves at once. These two waves, usually sinusoids, are out of phase with each other by 90° and are thus called quadrature carriers. Commonly abbreviated… …   Wiktionary

• quadrature — [ kwɒdrətʃə] noun 1》 Mathematics the process of constructing a square with an area equal to that of a circle or other curved figure. 2》 Astronomy the position of the moon or a planet when 90° from the sun in the sky. 3》 Electronics a phase… …   English new terms dictionary

• quadrature — /ˈkwɒdrətʃə / (say kwodruhchuh) noun 1. the act of squaring. 2. the act or process of finding a square equal in area to a given surface, especially a surface bounded by a curve. 3. Astronomy a. the situation of two heavenly bodies when their… …  

• quadrature — The relation between two waves of the same frequency but one quarter of a cycle (90°) out of phase, as in TV color difference signals …   Dictionary of automotive terms

• Phase (waves) — Phase in waves is the fraction of a wave cycle which has elapsed relative to an arbitrary point.[1] Contents 1 Formula 2 Phase shift 3 Phase difference …   Wikipedia

• Lamb waves — propagate in solid plates. They are elastic waves whose particle motion lies in the plane defined by the plate normal and the direction of wave propagation. In 1917, the English mathematician Horace Lamb published his classic analysis and… …   Wikipedia

• Phase-shift keying — Passband modulation v · d · e Analog modulation AM · …   Wikipedia

• Antenna (radio) — Whip antenna on car …   Wikipedia

• Buchla 200e — The Buchla 200e is a modular analog synthesizer designed by electronic music pioneer Don Buchla and built by Buchla and Associates. Modules 200e synthesizer platform includes several modules that roughly correspond to the canonical analog… …   Wikipedia