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
Abbreviation: AM, am. Compare frequency modulation
2.
a wave that has undergone this process
amplitude modulation in American English
1.
the variation of the amplitude of a carrier wave in accordance with the signal being broadcast
2.
a broadcasting system that uses this
Cf. frequency modulation
amplitude modulation in Electrical Engineering
(æmplɪtud mɒdʒəleɪʃən) or AM
noun
(Electrical engineering: Communication, Analog)
Amplitude modulation is a modulation method in which the carrier amplitude changes with the input signalamplitude.
The broadcast of a single signal, such as a monophonic audio signal, can be doneby straightforward amplitude modulation or frequency modulation.
In radio broadcasting amplitude modulation suffers more from atmospheric interference than frequency modulation.
Amplitude modulation is a modulation method in which the carrier amplitude changes with the input signalamplitude.