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.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.
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And Tables 1, 2, and 3 show the antinoise ability of the above three algorithms for two tested images, respectively.
Figure 6 demonstrates that when there exists noise, adaptive Fourier filter obtains better antinoise ability than conventional Kalman filter.
HUNDREDS of antinoise protesters marched on Downing Street yesterday in a demonstration against the decision to give the goahead to a fifth terminal at Heathrow Airport.
Antinoise enclosures and central dust extraction (2 x 10" pipes) recommended Torwegge H 604 Series 18,000-26,000 lbs.
The other, Jesus Pica Planas, is representative of most of these men, for creating a number of devices "striking in their uselessness," including an antinoise device for enamored cats and a mousetrap in the form of a guillotine.
The new technology will also allow automakers to make lighter vehicles as they will not need to add antinoise materials to chassis, they said.
104, 119 (1972) (upholding antinoise ordinance governing area around public schools because law "is narrowly tailored to further [city's] compelling interest in having an undisrupted school session conducive to the student's learning, and does not unnecessarily interfere with First Amendment rights.")
The antinoise circuitry can squelch sound at frequencies below roughly 1,200 hertz, reducing the noise to as little as one-eighth of its untreated loudness, says Michael A.
This "antinoise" only works on repeating low frequency noises (below 1500 Hz).
PUT A MUZZLE ON IT...An antinoise generator, a device designed to reduce the sound of buses, is being tested in New York, Houston and two transit systems in Southern California.
Engineers are now designing equipment that uses antinoise to silence loud machinery.
The Noise Cancellation Technologies exhaust muffler employs a feedback control design to generate an antinoise signal at the end of an automobile exhaust pipe.