NOISE CONTROL DEVICE - FUJITSU TEN LTD

Title:

NOISE CONTROL DEVICE

Document Type and Number:

WIPO Patent Application WO/1993/022763

Kind Code:

A1

Abstract:

A noise control device which comprises a speaker (3) arranged in the exit of a tail pipe (2) through which noises of the engine of an automobile are given off, the open end of which is at a given angle with respect to the plane vertical to the ground in the vicinity of the tail pipe (2) in order to silence the noises; an enclosure (21) tightly closing the rear part of the speakers (3 and 4); and a silencing sound guiding member (22) which guides the silencing sound released from the front end of the speaker (3) to the exit of the tail pipe (2). A bumper (23) which absorbs the shock at the time of collision is formed in a closed space. This closed space is used as the back cavities of the speakers (3 and 4). A plurality of microphones (5-1, 5-2, and 5-3) are arranged at given distances from the speakers (3 and 4). Their outputs are synthesized on the basis of the degrees of contributions to deaden noises.

Inventors:

SAKIYAMA KAZUHIRO (JP)
SAKO KAZUYA (JP)
NAGAMI MASAAKI (JP)
BABASAKI MASAHIRO (JP)

Application Number:

PCT/JP1993/000589

Publication Date:

November 11, 1993

Filing Date:

April 30, 1993

Export Citation:

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Assignee:

FUJITSU TEN LTD (JP)
SAKIYAMA KAZUHIRO (JP)
SAKO KAZUYA (JP)
NAGAMI MASAAKI (JP)
BABASAKI MASAHIRO (JP)

International Classes:

B60R19/48; F01N1/06; F01N1/22; F01N7/00; F16L55/033; G10K11/178; B60K13/04; (IPC1-7): G10K11/16; F01N1/00

Foreign References:

JPS5031801A	1975-03-28
JPS6252349A	1987-03-07
JPH01173406U	1989-12-08

Other References: