Active Noise Control

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Active Noise Control

The use of energy-consumptive systems to reduce “white” noise by applying specific algorithms and computer-controlled digital processors, to generate sounds opposite that of the undesired noise(s), effectively cancelling their effects.
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His silencer was crude and only marginally effective, but his "swirling water" theory stumbled on the fringe of the most efficient way for a suppressor to work -- sound cancellation.
is producing a variety of industrial sound cancellation systems including applications for HVAC ducts, material handling fans, and vacuum pumps.
The Berea, Ohio, company's patented Reflective Sound Cancellation (RSC) technology enhances performance sounds, reduces back pressure, and tunes out annoying droning and booming noises in performance exhaust systems for cars, trucks, SUVs, and boats.
They waste a lot of energy and cause many sound cancellations by bouncing the sound off the ceiling and floor.