(19)
(11) EP 0 412 725 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
09.10.1991 Bulletin 1991/41

(43) Date of publication A2:
13.02.1991 Bulletin 1991/07

(21) Application number: 90308534.8

(22) Date of filing: 02.08.1990
(51) International Patent Classification (IPC)5: H04S 5/00, H04S 5/02, H04S 1/00
(84) Designated Contracting States:
DE FR GB IT NL

(30) Priority: 05.08.1989 JP 203374/89

(71) Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
Kadoma-shi, Osaka-fu, 571 (JP)

(72) Inventors:
  • Ishikawa, Seiichi
    Hirakata-shi, Osaka-fu 573 (JP)
  • Tagami, Ryoh
    Hirakata-shi, Osaka-fu 573-01 (JP)
  • Shiota, Tomio
    Takatsuki-shi, Osaka-fu 569 (JP)

(74) Representative: Crawford, Andrew Birkby et al
A.A. THORNTON & CO. Northumberland House 303-306 High Holborn
London WC1V 7LE
London WC1V 7LE (GB)


(56) References cited: : 
   
       


    (54) Sound reproduction apparatus


    (57) During the reproduction of two central positioned signal by a pair of loudspeakers in a sound reproduction apparatus, the characteristic of sound propagation is lev­eled so that the perception of reproduced sound is possible without distortion at any location off the center line between the two loudspeakers. An input audio signal is passed through a filter for removing its low-band component and delayed by a delayer. The delay signal is then added to the input audio signal in approximately opposite-phase relationship to obtain two sum signals. The two sum signals are amplified by power amplifiers and reproduced by their respective loudspeakers.







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