amplitude modulation

noun

Abbreviation: AM.�� am.��one of the principal methods of transmitting audio, visual, or other types of information using radio waves, the relevant signal being superimposed onto a radio-frequency carrier wave. The frequency of the carrier wave remains unchanged but its amplitude is varied in accordance with the amplitude of the input signal Compare frequency modulation
a wave that has undergone this process

A method of transmitting signals, such as sound or digital information, in which the value of the signal is given by the amplitude of a high frequency carrier wave. In AM radio transmission, for example, the signal to be carried is a sound wave, and its increasing and decreasing value is reflected in the increasing and decreasing amplitude of the radio frequency carrier wave. In fiber optics, the carrier wave is a beam of light.
Compare frequency modulation

amplitude modulation

A type of radio signal in which the amplitude, or strength, of a radio wave is varied in order to carry information from a transmitter to a receiver. (Compare frequency modulation (FM).)

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It has been well documented that a song's volume, or loudness, over time -- what's known as "amplitude modulation" -- is relatively steady at 1-2 Hz.

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AM stands for amplitude modulation, used to transmit information in a radio wave.

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The difference between AM, or amplitude modulation, and FM, or frequency modulation, involves how sound waves are encoded into a signal that can be picked up by receivers.

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At the time all radio was AM, which stands for “amplitude modulation.”

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Pushing them up or down was called amplitude modulation: changing the loudness.��

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amplitude amply

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