Amplitude Modulation Wikipedia

Amplitude modulation - Wikipedia.

Amplitude modulation (AM) is a modulation technique used in electronic communication, most commonly for transmitting messages with a radio wave.In amplitude modulation, the amplitude (signal strength) of the wave is varied in proportion to that of the message signal, such as an audio signal.This technique contrasts with angle modulation, in which either the frequency of ....

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Modulation d'amplitude — Wikipédia.

La modulation d'amplitude ou MA (AM en anglais) est une technique utilisee pour moduler un signal. Elle consiste en la multiplication du signal a moduler par un signal de frequence plus elevee.. Definition. La modulation d'amplitude consiste a faire varier l'amplitude d'un signal de frequence elevee, le signal porteur, en fonction d'un signal de plus basse frequence, le signal ....

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Pulse-amplitude modulation - Wikipedia.

Pulse-amplitude modulation (PAM) is a form of signal modulation where the message information is encoded in the amplitude of a series of signal pulses. It is an analog pulse modulation scheme in which the amplitudes of a train of carrier pulses are varied according to the sample value of the message signal. Demodulation is performed by detecting the ....

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Amplitude - Wikipedia.

The amplitude of a periodic variable is a measure of its change in a single period (such as time or spatial period). The amplitude of a non-periodic signal is its magnitude compared with a reference value. ... Other parameters can be assigned steady state or transient amplitude envelopes: high/low frequency/amplitude modulation, Gaussian noise ....

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Signal-to-noise ratio - Wikipedia.

Signal-to-noise ratio (SNR or S/N) is a measure used in science and engineering that compares the level of a desired signal to the level of background noise.SNR is defined as the ratio of signal power to the noise power, often expressed in decibels.A ratio higher than 1:1 (greater than 0 dB) indicates more signal than noise..

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Quadraturamplitudenmodulation – Wikipedia.

Die Quadraturamplitudenmodulation, oder Quadratur-Amplituden-Modulation (Abkurzung QAM, englisch Quadrature amplitude modulation), ist ein Modulationsverfahren in der elektronischen Nachrichtentechnik, das die Amplitudenmodulation und Phasenmodulation kombiniert. Sie wird in der Fachliteratur uberwiegend zu den digitalen Modulationsverfahren ....

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Modulation (Technik) – Wikipedia.

Der Begriff Modulation (lat. modulatio = Takt, Rhythmus) beschreibt einen Vorgang in der Nachrichtentechnik, bei dem ein zu ubertragendes Nutzsignal (beispielsweise Musik, Sprache, Daten) einen sogenannten Trager verandert (moduliert). Dadurch wird eine hochfrequente Ubertragung des niederfrequenten Nutzsignals ermoglicht. Das Sendesignal belegt im Bereich ....

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Quadrature amplitude modulation - Wikipedia.

Quadrature amplitude modulation (QAM) is the name of a family of digital modulation methods and a related family of analog modulation methods widely used in modern telecommunications to transmit information. It conveys two analog message signals, or two digital bit streams, by changing (modulating) the amplitudes of two carrier waves, using the amplitude-shift keying ....

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Code-division multiple access - Wikipedia.

Code-division multiple access (CDMA) is a channel access method used by various radio communication technologies. CDMA is an example of multiple access, where several transmitters can send information simultaneously over a single communication channel.This allows several users to share a band of frequencies (see bandwidth).To permit this without undue interference ....

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Non-return-to-zero - Wikipedia.

In telecommunication, a non-return-to-zero (NRZ) line code is a binary code in which ones are represented by one significant condition, usually a positive voltage, while zeros are represented by some other significant condition, usually a negative voltage, with no other neutral or rest condition.. For a given data signaling rate, i.e., bit rate, the NRZ code requires only half the ....

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Modulation du signal — Wikipédia.

En modulation analogique, la modulation est appliquee a la porteuse ou aux sous-porteuses proportionnellement au signal a transmettre, en modifiant l'amplitude ou l'argument de l'onde sinusoidale. Modulations d'amplitude. Modulation d'amplitude a deux bandes laterales (AM) :; La modulation d'amplitude issue directement de la multiplication de l'onde porteuse par le ....

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VOR (navigation aérienne) — Wikipédia.

Les versions recentes de VOR exploitent donc la solution statique, dans laquelle la rotation est obtenue par modulation d'amplitude en quadrature. Principe (simplifie) du VOR/D. Il utilise l'effet Doppler. Son principe est l'inverse du VOR/C. Sur un VOR/D, le signal omnidirectionnel est module en AM et le signal directionnel en FM..

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Multiple frequency-shift keying - Wikipedia.

A fading channel effectively imposes an unwanted random amplitude modulation on the signal. Just as the bandwidth of intentional AM increases with the modulation rate, fading spreads a signal over a frequency range that increases with the fading rate. This is Doppler spreading, the frequency domain counterpart of coherence time. The shorter the ....

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Electro-optic modulator - Wikipedia.

An electro-optic modulator (EOM) is an optical device in which a signal-controlled element exhibiting an electro-optic effect is used to modulate a beam of light.The modulation may be imposed on the phase, frequency, amplitude, or polarization of the beam. Modulation bandwidths extending into the gigahertz range are possible with the use of laser-controlled ....

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Modular synthesizer - Wikipedia.

History. The first modular synthesizer was developed by German engineer Harald Bode in the late 1950s. The 1960s saw the introduction of the Moog synthesizer and the Buchla Modular Electronic Music System, created around the same period. The Moog was composed of separate modules which created and shaped sounds, such as envelopes, noise generators, filters, and ....

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Waveform - Wikipedia.

In electronics, acoustics, and related fields, the waveform of a signal is the shape of its graph as a function of time, independent of its time and magnitude scales and of any displacement in time.. In electronics, the term is usually applied to periodically varying voltages, currents, or electromagnetic fields.In acoustics, it is usually applied to steady periodic sounds--variations ....

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Mach–Zehnder interferometer - Wikipedia.

In physics, the Mach-Zehnder interferometer is a device used to determine the relative phase shift variations between two collimated beams derived by splitting light from a single source. The interferometer has been used, among other things, to measure phase shifts between the two beams caused by a sample or a change in length of one of the paths. The apparatus is named ....

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Modulation index - Wikipedia.

The modulation index (or modulation depth) of a modulation scheme describes by how much the modulated variable of the carrier signal varies around its unmodulated level. It is defined differently in each modulation scheme. Amplitude modulation index; Frequency modulation index; Phase modulation index.

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Contrast (vision) - Wikipedia.

Contrast is the difference in luminance or colour that makes an object (or its representation in an image or display) distinguishable. In visual perception of the real world, contrast is determined by the difference in the colour and brightness of the object and other objects within the same field of view.The human visual system is more sensitive to contrast than absolute luminance; we can ....

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