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Amplitude Modulation

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Amplitude modulation (AM) is a technique used in electronic communication, most commonly for transmitting information via a radio ...

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Description

Amplitude modulation (AM) is a technique used in electronic communication, most commonly for transmitting information via a radio carrier wave. AM works by varying the strength of the transmitted signal in relation to the information being sent. For example, changes in the signal strength can be used to reflect the sounds to be reproduced by a speaker, or to specify the light intensity of television pixels. (Contrast this with frequency modulation, also commonly used for sound transmissions, in which the frequency is varied; and phase modulation, often used in remote controls, in which the phase is varied). In the mid-1870s, a form of amplitude modulation initially called "undulatory currents" was the first method to successfully produce quality audio over telephone lines. Beginning with Reginald Fessenden's audio demonstrations in 1906, it was also the original method used for audio radio transmissions, and remains in use today by many forms of communication "AM" is often used to refer to the mediumwave broadcast band.

Informations sur le produit

Titre:

Amplitude Modulation

Sous-titre :

Radio, Frequency modulation, Frequency, Phase modulation, Remote control, Phase (waves), Reginald Fessenden, Medium wave, AM broadcasting, Longwave, Shortwave, Modulation, Sideband

éditeur:

Frederic P. Miller

Agnes F. Vandome

John McBrewster

EAN:

9786130220402

ISBN:

978-613-0-22040-2

Format:

Couverture cartonnée

Editeur:

Alphascript Publishing