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Noun: modulator  'mó-ju,ley-tu(r) [N. Amer], 'mód-yû,ley-tu(r) [Brit]
  1. A person or device that regulates or varies the amplitude, frequency, or phase of an oscillation
    "The radio transmitter uses a modulator to encode the audio signal"

Derived forms: modulators

Encyclopedia: Modulator