The Collaborative International Dictionary
Modulate \Mod"u*late\, v. t. [imp. & p. p. Modulated; p. pr. & vb. n. Modulating.] [L. modulatus, p. p. of modulari to measure, to modulate, fr. modulus a small measure, meter, melody, dim. of modus. See Mode.]
To form, as sound, to a certain key, or to a certain portion.
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To vary or inflect in a natural, customary, or musical manner; as, the organs of speech modulate the voice in reading or speaking.
Could any person so modulate her voice as to deceive so many?
--Broome. (Electronics) To alter the amplitude, frequency, phase, or intensity of (the carrier wave of a radio signal) at intervals, so as to represent information to be conveyed by the signal; -- a technique used to convey information by means of radio waves transmitted by one electronic device and received by another.
Wiktionary
vb. (present participle of modulate English)
Usage examples of "modulating".
But we are modulating it to give a carrier wave in radio frequency, then modulating that into audio frequency-and controlling that by a piano.
We don't know how efficient those…constructions were at converting energy into the longer radio wavelengths and modulating them.
They communicate by modulating polarized light—switching rapidly back and forth to different planes of polarization.
But Robinton repeated the odd discord, then modulating into a weird minor that was somehow more disturbing than the first notes.
It was a rolling, modulating cry that seemed to emanate from the air around us.