Active noise-attenuating duct element

Details Active noise-attenuating duct element Active noise-attenuating duct element

2006-02-28

2006-02-28

Grier, Laura A. (Department: 2644)

Electrical audio signal processing systems and devices

Loudspeaker feedback

C381S071500

Reexamination Certificate

active

07006639

ABSTRACT:
The active HVAC duct element can be inserted into a HVAC duct for attenuation of noise. The element works with an acoustical series arrangement of a passive acoustical component and an active acoustical component.

REFERENCES:
patent: 4665549 (1987-05-01), Eriksson et al.
patent: 5452362 (1995-09-01), Burward-Hoy
patent: 5619020 (1997-04-01), Jones et al.
patent: 5812686 (1998-09-01), Hobelsberger
patent: 6088459 (2000-07-01), Hobelsberger

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