modulate

Is your friend's voice so high-pitched that people are starting to stare? Sweetly ask, "Can you modulate your voice, please? To modulate is to change the pitch of something.

You can modulate things other than sound — it still refers to something that's being adjusted. Schools might modulate the number of students in the hallways at the same time by having each grade level start and end each at a different time. Traffic lights can modulate the number of cars that pass through an intersection in a certain interval. Computer modems modulate signals to allow computers to transfer information. In fact, modem gets its name from modulate/demodulate.

Definitions of modulate
1

v fix or adjust the time, amount, degree, or rate of

modulate the pitch”
Synonyms:
regulate
Type of:
adjust, correct, set
alter or regulate so as to achieve accuracy or conform to a standard

v adjust the pitch, tone, or volume of

Type of:
adjust, correct, set
alter or regulate so as to achieve accuracy or conform to a standard

v change the key of, in music

modulate the melody”
Type of:
play, spiel
replay (as a melody)

v vary the pitch of one's speech

Synonyms:
inflect, tone
Type of:
mouth, speak, talk, utter, verbalise, verbalize
express in speech

v vary the frequency, amplitude, phase, or other characteristic of (electromagnetic waves)

Type of:
alter, change, vary
become different in some particular way, without permanently losing one's or its former characteristics or essence

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