quadrature signal

См. также в других словарях:

• 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 — Quadrature, derived from Latin quadrare , may refer to:In signal processing: *Quadrature amplitude modulation (QAM), a modulation method of using both a carrier wave and a quadrature carrier wave that is 90° out of phase with the main carrier… …   Wikipedia

• SIGNAL (THÉORIE DU) — La théorie du signal est un chapitre de la théorie de la communication . La communication est la transmission de messages d’information. Elle met en relation orientée à travers un canal un système de départ (source ou émetteur de messages) et un… …   Encyclopédie Universelle

• Quadrature phase-shift keying — Phase shift keying Traduction terminée Phase shift keying → …   Wikipédia en Français

• Quadrature filter — In signal processing, a quadrature filter q(t) is the analytic representation of the impulse response f(t) of a real valued filter::q(t) = f {a}(t) = left(delta(t) + {i over pi t} ight) * f(t)If the quadrature filter q(t) is applied to a signal… …   Wikipedia

• Quadrature amplitude modulation — Quadraturamplitudenmodulation (Abkürzung: QAM, engl: Quadrature Amplitude Modulation) ist eine Modulationsart in der elektronischen Nachrichtentechnik, die Amplitudenmodulation und Phasenmodulation miteinander kombiniert. Dabei werden derselben… …   Deutsch Wikipedia

• Quadrature amplitude modulation — Modulation d amplitude en quadrature La modulation d amplitude en quadrature (en anglais, Quadrature Amplitude Modulation ou QAM) est une forme de modulation d une porteuse par modification de l amplitude de la porteuse elle même et d une onde en …   Wikipédia en Français

• Quadrature mirror filter — In digital signal processing, a quadrature mirror filter is a filter most commonly used to implement a filter bank that splits an input signal into two bands. The resulting high pass and low pass signals are often decimated by a factor of 2,… …   Wikipedia

• Quadrature Phase Shift Keying — Die Quadraturphasenumtastung oder Vierphasen Modulation (englisch Quadrature Phase Shift Keying, QPSK) ist ein digitales Modulationsverfahren in der Nachrichtentechnik. Mit QPSK können pro Sendesymbol zwei Bits übertragen werden. Dadurch… …   Deutsch Wikipedia

• quadrature amplitude modulation —    In communications, a data encoding technique used by modems. Quadrature amplitude modulation is a combination of phase and amplitude change that can encode multiple bits on a single carrier signal. For example, the CCITT V.42bis standard uses… …   Dictionary of networking

• quadrature mirror filter — n. (Computers) filter that splits an input signal into two bands which are subsampled by a factor of 2 …   English contemporary dictionary