Physics
The sounds having a frequency of 20 Hertz to 20,000 Hertz are known as

Audible sounds
Ultrasonics
Megasonics
Infrasonics

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Physics
Analog synthesis refers to a technology based on

Representing physical quantities as numbers.
Representing data in terms of measurable physical quantities.
Interfacing synthesizer equipment.
Placing brief digital recordings of live sounds under the control of a synthesizer keyboard.

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