Title:
ACOUSTIC REFLECTOR
Document Type and Number:
WIPO Patent Application WO1994022274
Kind Code:
A1
Abstract:
The surface of an acoustic reflector faces the source, and has a plurality (N) of wells, where N is an odd prime number. Each well has a depth Dn=(n<2> rem N)* unit depth (0<=n<=N-1), governed by a Quadratic Residue Sequence. Acoustic energy directed from the source to the reflector, and reflected along a length direction of the reflector, has substantially equal acoustic energy in all angular directions from the reflector within plus and minus pi /2 from the direction of radiation. The surface above can be used for the surface of a loudspeaker, where either it is the surface of the loudspeaker or has speakers positioned at the bottom of the wells. The surface above can also be used for drag reduction in moving vehicles when it is positioned either at the front or rear of the vehicle.
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| JP2020011543 | ATTITUDE CONTROLLER FOR VEHICLE |
Inventors:
HAYES JOSEPH FRANCIS (AU)
Application Number:
PCT/AU1994/000146
Publication Date:
September 29, 1994
Filing Date:
March 23, 1994
Export Citation:
Assignee:
HAYES JOSEPH FRANCIS (AU)
International Classes:
B62D35/00; F15D1/10; H04R1/34; (IPC1-7): H04R1/34; B62D35/00; F15D1/10; H04R1/32
Domestic Patent References:
| WO1994002744A1 | 1994-02-03 |
Foreign References:
| US4800983A | 1989-01-31 | |||
| EP0275195A2 | 1988-07-20 | |||
| US4395652A | 1983-07-26 | |||
| US4081626A | 1978-03-28 | |||
| US5108145A | 1992-04-28 | |||
| US4682808A | 1987-07-28 | |||
| GB2149054A | 1985-06-05 |
Other References:
DERWENT ABSTRACT, Accession No. M2041E/37, Class Q22; & SU,A,878 639 (KAZA CAR TRANSPORT), 7 November 1981.
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