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amplitude modulation |
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amplitude modulation: see modulation modulation, in communications, process in which some characteristic of a wave (the carrier wave) is made to vary in accordance with an information-bearing signal wave (the modulating wave); demodulation is the process by which the original signal is recovered from ..... Click the link for more information. ; radio radio, transmission or reception of electromagnetic radiation in the radio frequency range. The term is commonly applied also to the equipment used, especially to the radio receiver. ..... Click the link for more information. . AMin full amplitude modulationVariation of the amplitude of a carrier wave (commonly a radio wave) in correspondence to fluctuations in the audio or video signal being transmitted. AM is the oldest method of broadcasting radio programs. Commercial AM stations operate in the frequency range of 535 to 1605 kHz. Because radio waves of these frequencies are reflected back to the Earth's surface by the ionosphere, they can be detected by receivers hundreds of miles away. In addition to commercial radio broadcasting, AM is also employed in short-wave radio broadcasts, and in transmitting the video portion of television programs. See also FM. amplitude modulationVarying the voltage of a carrier or a direct current in order to transmit analog or digital data. Amplitude modulation (AM) is the oldest method of transmitting human voice electronically. In an analog telephone conversation, the voice waves on both sides are modulating the voltage of the direct current loop connected to them by the telephone company.
amplitude modulation [′am·plə‚tüd ‚maj·ə′lā·shən] (electronics) Abbreviated AM. Modulation in which the aplitude of a wave is the characteristic varied in accordance with the intelligence to be transmitted. In telemetry, those systems of modulation in which each component frequencyfof the transmitted intelligence produces a pair of sideband frequencies at carrier frequency plusfand carrier minusf.
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