(sound, radio) the use of a modulating wave to vary the instantaneous frequency of a carrier wave

A method of sending information by modifying (modulating) the difference in phase (fraction of a wave length) between a signal and a reference.

(radio) A method of sending information by modifying (modulating) the intensity (amplitude) of a carrier wave.

an electronic circuit that causes the phase angle of a modulated wave to vary in accordance with the modulating signal

Any of a number of techniques whereby a series of information-carrying quantities occurring at discrete instances of time is encoded into a corresponding series of electromagnetic carrier pulses.

A device for the pulse modulation of a radio-frequency carrier signal

plural of phase modulator

plural of amplitude modulation

(astronautics) The spacecraft used in the Apollo missions that was designed for the landing on the surface of the Moon; the lunar excursion module.

plural of lunar module