Method and apparatus for active noise control in an air...

Details Method and apparatus for active noise control in an air... Method and apparatus for active noise control in an air...

2005-01-04

2005-01-04

Mei, Xu (Department: 2644)

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Within duct

C381S071700, C181S224000

Reexamination Certificate

active

06839439

ABSTRACT:
An air induction system for an internal combustion engine utilizes localized heat generation to produce a desired acoustic profile that attenuates noise propagated through the air induction system. The noise propagated through the air induction system varies over time to form a variable noise profile. A heat generating mechanism, such as a laser array or electric spark generator, produces a predetermined amount of heat within a localized area adjacent to an inlet to the air duct housing. The predetermined amount of heat is an amount of heat sufficient to produce a desired acoustic energy as a result of rapid air expansion at the localized area. A controller varies the predetermined amount of heat over time to produce a desired acoustic profile that cancels the variable noise profile.

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