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Title:
DIRECTIONAL SPEAKER SYSTEM
Document Type and Number:
WIPO Patent Application WO/1986/001670
Kind Code:
A1
Abstract:
A parametric speaker which reproduces audible sound having sharp directivity by utilizing non-linearity of the air for ultrasonic waves. Namely, the invention provides a listening area-limiting loudspeaker system wherein provision is made for a frame (12) to shut off intense ultrasonic waves, and an acoustic filter (10) to maintain safety for a listener (9). The depth of the parametric speaker is reduced by using a reflecting plate (19) to reduce space. Further, a moving mechanism is provided for an ultrasonic wave generator (8) or the reflecting plate (19) to obtain directivity. Moreover, the parametric speaker is combined with any other speaker (37) to offer a wide listening area.

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Inventors:
TANAKA TSUNEO (JP)
IWASA MIKIO (JP)
KIMURA YOUCHI (JP)
NAKAMURA AKIRA (JP)
Application Number:
PCT/JP1985/000469
Publication Date:
March 13, 1986
Filing Date:
August 26, 1985
Export Citation:
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Assignee:
MATSUSHITA ELECTRIC IND CO LTD (JP)
International Classes:
G10K11/28; G10K15/02; H04R1/32; H04R1/34; H04R27/00; (IPC1-7): H04R1/32; H04R3/00; G10K11/18
Foreign References:
JPS58119293A1983-07-15
JPS5061022U1975-06-05
JPS5141434U1976-03-27
JPS3817225B1
JPS4710794Y11972-04-21
JPS50132030U1975-10-30
GB928377A1963-06-12
JPS4811326Y11973-03-27
JPS537221A1978-01-23
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