DictionarymodulatorRegulating device or substance
noun

modulator

MAH-juh-lay-ter/mˈɑdʒʌlˌeɪtɝ/

A device or substance that controls or adjusts how something operates.

The modulator adjusts the signal before it reaches the antenna.

A sound modulation device on a desk with knob and input/output waveforms showing controlled changed amplitude, no branding.
Etymology

A modulator was literally one who measured by rule—a regulator, including a musical director. That regulating role extends to a person or device that adjusts a quality or controls a wave.

In context

NPTEL-NOC IITM4:47
So you can give a frequency to this particular modulator and you can modulate the light intensity output of the modulator.
Lab Demonstration: Manipulation of Light Electro Optic Modulator (EOM)

More examples

  • This drug acts as a modulator of the immune response.
  • A faulty modulator distorts the radio signal.
  • The technician tests both modulators before installing them.

Forms

modulator · modulators

modulate verb — To control or adjust how something operates.

modulation noun — The adjustment of a signal, process, or activity.

Similar words

regulator
Often maintains a steady level rather than varying a pattern.
controller
Usually directs an entire system rather than adjusting one activity.