Acoustics is the interdisciplinary science that deals with the study of sound, ultrasound and infrasound, all mechanical waves in gases, liquids and solids respectively.
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Active noise control is the modification of an unwanted sound by using an electromechanical source to generate another interfering sound.
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Ultrasound is cyclic sound pressure with a frequency of 20 kilohertz or over, greater than the upper limit of human hearing.
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