null-frequency

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• Null fill — is used in radio antenna systems which are located on mountains or tall towers, to prevent too much of the signal from overshooting the nearest part of intended coverage area. Phasing is used between antenna elements to take power away from the… …   Wikipedia

• Null-steering beamformer — Null Steering is a method of beam forming for narrow band signals where we want to have a simple way of compensating delays of receiving signals from a specific source at different elements of the antenna array. In general to make use of the… …   Wikipedia

• Null dust solution — In mathematical physics, a null dust solution (sometimes called a null fluid) is a Lorentzian manifold in which the Einstein tensor is null. Such a spacetime can be interpreted as an exact solution of Einstein s field equation, in which the only… …   Wikipedia

• Null hypothesis — For the periodical, see Null Hypothesis: The Journal of Unlikely Science. The practice of science involves formulating and testing hypotheses, assertions that are capable of being proven false using a test of observed data. The null hypothesis… …   Wikipedia

• Frequency mixer — This article is about non linear mixing operating in the frequency domain. For other types of mixers, see electronic mixer. Frequency Mixer Symbol. In electronics a mixer or frequency mixer is a nonlinear electrical circuit that creates new… …   Wikipedia

• Null modem — Modem  Pour le MoDem, voir Mouvement démocrate (France). Le modem (mot valise, pour modulateur démodulateur), est un périphérique servant à communiquer avec des utilisateurs distants par l intermédiaire d une ligne téléphonique. Il permet… …   Wikipédia en Français

• Configural frequency analysis — (CFA) (Lienert, 1969) is a method of exploratory data analysis. The goal of a configural frequency analysis is to detect patterns in the data that occur significantly more (such patterns are called Types) or significantly less often (such… …   Wikipedia

• Four-frequency — The four frequency of a photon is defined by :N^a = left( u, u mathbf{n} ight)where u is the photon s frequency and mathbf{n} is a unit vector in the direction of the photon s motion. The four frequency is always a null vector. Closely related to …   Wikipedia

• Automatic Frequency Control — Die Automatische Frequenzregelung (AFC, von engl. Automatic Frequency Control) dient beim Rundfunkempfang mittels eines Überlagerungsempfängers dazu, den Empfänger (Tuner Receiver, Fernsehempfangsteil) nach der Senderwahl automatisch auf diesen… …   Deutsch Wikipedia

• Automatic frequency control — Die Automatische Frequenzregelung (AFC, von engl. Automatic Frequency Control) dient beim Rundfunk oder Fernsehempfang mittels eines Überlagerungsempfängers dazu, den Empfangsteil (Tuner) nach der Senderwahl automatisch auf diesen abgestimmt zu… …   Deutsch Wikipedia

• Modified Frequency Modulation — (MFM) ist ein Aufzeichnungsverfahren und eine Leitungscodierung welche unter anderem bei magnetischen Datenträgern wie Magnetband oder Diskette Anwendung findet. MFM stellt einen (1,3) RLL Code mit anschließender NRZI Codierung dar und ist eine… …   Deutsch Wikipedia