Acoustic actuator and passive attenuator incorporating a...

Details Acoustic actuator and passive attenuator incorporating a... Acoustic actuator and passive attenuator incorporating a...

2011-02-08

2011-02-08

Kuntz, Curtis (Department: 2614)

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Particular transducer or enclosure structure

C381S347000, C381S353000, C181S199000

Reexamination Certificate

active

07885418

ABSTRACT:
Disclosed is a loudspeaker assembly incorporating innovations resulting in an enclosure of very small volume to which is integrated a large area, shallow and lightweight acoustic diaphragm assembly capable of a natural resonant frequency of a few Hertz. This is achieved by incorporating a vacuum chamber in conjunction with a chamber containing compressed gas or vapor that acts against a movable pressure boundary of changeable area being mechanically coupled with the acoustic radiating diaphragm. In an alternative operating mode, the apparatus also serves as a passive low frequency acoustic attenuator.

REFERENCES:
patent: 4064375 (1977-12-01), Russell et al.
patent: 5060274 (1991-10-01), Asami et al.
patent: 6195442 (2001-02-01), Griffin et al.
patent: 6736425 (2004-05-01), Lemon et al.
patent: 2004/0136560 (2004-07-01), Walsh

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