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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References in periodicals archive ?
The tests will allow engineers to verify the design of the sound suppression system being developed for the agency's new deep space rocket.
has introduced a filtered earplug called the HearDefender that's a variable attenuator; as the noise level rises, the sound suppression increases.
They make no promises, however, about sound suppression. The company's range includes socks that prevent feet from smelling and vests that mask BO.
A pressurized elevating cab with air conditioning, heating and sound suppression offers comfort for the operator.
On the move, the sound suppression is good, with very little road, wind or engine noise.
There''s plenty of storage space and on the move the sound suppression is good with very little road, wind or engine noise.
Meanwhile, the inner core fairings incorporate proprietary all-welded titanium honeycomb technology, which gives excellent sound suppression along with a lighter, more durable and more easily repaired structure.
Sound suppression is standard for environmental protection and improved operator comfort.
To reduce engine noise, the crane can be supplied with a sound suppression kit.
The measuring method of airborne sound suppression by partitions under laboratory conditions is presented according to LST EN ISO 140-3.
The values of acoustic characteristics of walls, ceiling, floors and partition used in the model were taken from certain documentations of manufacturers: air density [rho] = 1.2 kg/[m.sup.3]; velocity of sound wave propagation c = 335 m/s; suppression coefficient of air sound [mu] = 0; density of sound suppression's partition [rho] = 750 kg/[m.sup.3]; elasticity module of sound suppression's partition E = 3.4 x [10.sup.9] Pa; velocity of sound propagation in partition's material [c.sub.P] = 675 m/s; coefficient of sound suppression's partition [mu] = 0.9.