active sound cancellation

active sound cancellation

[¦ak·tiv ′saund ‚kan·sə‚lā·shən]
(acoustics)
Any technique in which a control sound source creates sound in a selected region equal in amplitude and opposite in phase to sound that would otherwise exist, but this sound cancellation cannot be maintained in the presence of system changes unless there is also a feedback mechanism.
References in periodicals archive ?
For active sound cancellation in the lower frequency range below 125 Hz, the electroacoustic component emits a sound with a wavelength that superimposes the targeted existing sound wave in such a way that, ideally, the two waves cancel each other out.