Title (en)

STEREOPHONIC LOUDSPEAKER

Publication

EP 0248172 A3 19890524 (FR)

Application

EP 87105422 A 19870411

Priority

CH 228286 A 19860605

Abstract (en)

[origin: US4837826A] A stereophonic baffle comprises a first transducer group (7 to 10) located along a first line and fed by a right signal of a Hi-Fi chain and a second group of transducers (11 and 15) located according to a second line, forming an angle with the first line, and fed by a left signal. The left and right signals feeding the groups of transducers (7 and 10 and 11 to 15) are in phase and the path (a to e) separating the active zones of the two associated transducers (6,11; 7,12; 8,13; 9,14; 10,15) is equal to an odd multiple of the half wave length of a frequency comprised between 300 and 1000 Hz thus creating an acoustic coupling for the frequency, between the two transducers. The coupling frequencies of the different transducer couples are different.

IPC 1-7

H04R 5/02; H04R 1/40

IPC 8 full level

H04R 1/40 (2006.01); H04R 5/02 (2006.01)

CPC (source: EP KR US)

H04R 1/403 (2013.01 - EP US); H04R 5/00 (2013.01 - KR); H04R 5/02 (2013.01 - EP US); H04R 2205/022 (2013.01 - EP US)

Citation (search report)

• [A] US 3892624 A 19750701 - SHIMADA SATOSHI
• [A] US 4249037 A 19810203 - DEXTER JOHN L
• [A] FR 2378418 A1 19780818 - RANK ORGANISATION LTD [GB]
• [A] US 4365688 A 19821228 - BLOSE WILLIAM G
• [AD] US 4572325 A 19860225 - SCHUPBACH WALTER [CH]

Designated contracting state (EPC)

AT BE CH DE ES FR GB GR IT LI LU NL SE

DOCDB simple family (publication)

EP 0248172 A2 19871209; EP 0248172 A3 19890524; EP 0248172 B1 19930602; AT E90171 T1 19930615; AU 594779 B2 19900315; AU 7383787 A 19871210; CA 1280376 C 19910219; CH 667174 A5 19880915; DE 248172 T1 19880407; DE 3786040 D1 19930708; DE 3786040 T2 19940105; DK 222387 A 19871206; DK 222387 D0 19870501; ES 2000246 A4 19880201; ES 2000246 T3 19931201; GR 880300013 T1 19881018; JP S62292098 A 19871218; KR 880001168 A 19880331; KR 940011761 B1 19941223; NO 170830 B 19920831; NO 170830 C 19921209; NO 872309 D0 19870602; NO 872309 L 19871207; NZ 220304 A 19890927; US 4837826 A 19890606

DOCDB simple family (application)

EP 87105422 A 19870411; AT 87105422 T 19870411; AU 7383787 A 19870604; CA 537107 A 19870514; CH 228286 A 19860605; DE 3786040 T 19870411; DE 87105422 T 19870411; DK 222387 A 19870501; ES 87105422 T 19870411; GR 880300013 T 19880520; JP 10338487 A 19870428; KR 870004627 A 19870512; NO 872309 A 19870602; NZ 22030487 A 19870514; US 3853487 A 19870414