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amplitude modulation

  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

See amplitude modulation in American Heritage Dictionary 4

noun Abbr. AM
  1. The encoding of a carrier wave by variation of its amplitude in accordance with an input signal.
  2. A broadcast system that uses amplitude modulation.

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amplitude modulation

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