Directional acoustic device

Details Directional acoustic device Directional acoustic device

2007-09-14

2009-06-23

Pham, Toan N (Department: 2612)

Communications: electrical

Audible indication

Electronic

C340S384730, C340S384100, C367S093000, C367S094000

Reexamination Certificate

active

07551062

ABSTRACT:
A directional acoustic device configured for producing a directional output along an acoustic axis, including at least one transducer configured to create at least two wave trains which are directed along differing pathways by at least one wave guide, and so disposed that in directions more than ninety degrees off the acoustic axis the SPL of the output is greatly diminished by cancellation effects between the wave trains; improvement over previous gradient and quarter-wave pipe directional systems being enabled.

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patent: WO 0079833 (2000-12-01), None
patent: WO 2004 002190 (2003-12-01), None

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