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amplitude modulation
noun
- 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 AbbreviationAMam Compare frequency modulation
- a wave that has undergone this process
amplitude modulation
- 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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Example Sentences
Eight of the targets showed a definite amplitude modulation on the echo.
From Project Gutenberg
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