Phase noise — is the frequency domain representation of rapid, short term, random fluctuations in the phase of a wave, caused by time domain instabilities ( jitter ). Generally speaking radio frequency engineers speak of the phase noise of an oscillator,… … Wikipedia
Phase modulation — (PM) is a form of modulation that represents information as variations in the instantaneous phase of a carrier wave.Unlike its more popular counterpart, frequency modulation (FM), PM is not very widely used. This is because it tends to require… … Wikipedia
phase — [ faz ] n. f. • 1661 astron.; h. 1544 fig.; répandu XIXe; gr. phasis « lever d une étoile » 1 ♦ Astron. Chacun des aspects que présentent la Lune et les planètes à un observateur terrestre, selon leur éclairement par le Soleil. ⇒ apparence. Les… … Encyclopédie Universelle
Phase Boundary Catalysis — (PBC) in chemistry is a type of heterogeneous catalytic system which facilitates the chemical reaction of a particular chemical component in immiscible phase react on a catalytic active site located at phase boundary. The chemical component is… … Wikipedia
Index (base de donnees) — Index (base de données) En informatique, et en particulier dans le contexte des bases de données, un index est un élément de redondance que l on va spécifier pour permettre au Système de Gestion de Base de Données d optimiser certaines requêtes.… … Wikipédia en Français
Phase dispersion minimization — (PDM) is a data analysis technique that searches for periodic components of a time series data set. It is useful for data sets with gaps, non sinusoidal variations, poor time coverage or other problems that would make Fourier techniques unusable … Wikipedia
Phase 5 — Ulli Meybohms HTML Editor phase 52 (Release: 21. Jan 2000) Basisdaten Entwickler: Hans Dieter Berretz (aktuell) Ulli Meybohm … Deutsch Wikipedia
phase microscope — n PHASE CONTRAST MICROSCOPE * * * phase contrast microscope a microscope that converts variations of the refracting index in the object into variations of intensity in the image. Altering the phase relationship of light passing through and that… … Medical dictionary
phase — I (aspect) noun angle, consideration, facet, feature, part, point, portion, ratio, section, side, status II (period) noun age, continuance, duration, epoch, era, measured time, moment, period of time, point, point of time, season, session, shift … Law dictionary
Phase-locked loop — PLL redirects here. For other uses, see PLL (disambiguation). A phase locked loop or phase lock loop (PLL) is a control system that generates an output signal whose phase is related to the phase of an input reference signal. It is an electronic… … Wikipedia
