(19)
(11) EP 0 742 545 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
16.07.1997 Bulletin 1997/29

(43) Date of publication A2:
13.11.1996 Bulletin 1996/46

(21) Application number: 96303220.6

(22) Date of filing: 08.05.1996
(51) International Patent Classification (IPC)6: G10K 11/175
(84) Designated Contracting States:
DE FR IT

(30) Priority: 09.05.1995 JP 135865/95

(71) Applicant: Bridgestone Corporation
Tokyo (JP)

(72) Inventors:
  • Murase, Masanori
    Kodaira-shi, Tokyo (JP)
  • Kudo, Hirokazu
    Hoya-shi, Tokyo (JP)
  • Omi, Kenji
    Iruma-shi, Saitama-ken (JP)
  • Mizuno, Keiichiro
    Tokyo (JP)

(74) Representative: Whalley, Kevin 
MARKS & CLERK, 57-60 Lincoln's Inn Fields
London WC2A 3LS
London WC2A 3LS (GB)

   


(54) Interference noise-control unit


(57) In the interference noise-control unit according to the present invention, the sound inlets (2A to 2D) are positioned little by little higher in a direction away from the soundproof wall (1) so that the ends thereof are on a gentle ascending slope. The channels (21 to 24) are bent toward the soundproof wall (1) on their ways from the sound inlets (2A to 2D) to the sound outlets (2E to 2H), the bending angles of the channels (21 to 24) being increased in the direction away from the soundproof wall (1). Therefore, the noise-control unit according to the present invention is highly effective against a noise from a lower source as well as against a noise from an upper source.






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