Global Patent Index - EP 1042866 A4

EP 1042866 A4 2003-06-18 - METHOD AND SYSTEM FOR DRIVING SPEAKERS WITH A 90 DEGREE PHASE SHIFT

Title (en)

METHOD AND SYSTEM FOR DRIVING SPEAKERS WITH A 90 DEGREE PHASE SHIFT

Title (de)

VERFAHREN UND VORRICHTUNG ZUM TREIBEN VON LAUTSPRECHERN MIT EINER 90 GRADPHASENVERSCHIEBUNG

Title (fr)

PROCEDE ET SYSTEME DE HAUT-PARLEUR A DECALAGE DE PHASE DE 90 DEGRES

Publication

EP 1042866 A4 (EN)

Application

EP 98966031 A

Priority

  • US 9827174 W
  • US 6871697 P

Abstract (en)

[origin: WO9933173A1] A method and system for providing enhanced coupling of a stereophonic pair of full-range loudspeakers (5, 6) or subwoofers (8, 9) to all room modes of a laterally symmetric listening room wherein the preferred location of a listener is on the lateral center line thereof, by applying the left and right audio signals (30, 32) or the low frequency components thereof through a pair of all-pass phase shift networks having an in-phase relationship at low audio frequencies where localization is not possible. The method and system may further be compensated by a 3 dB bass boost in each channel to provide the same sound pressure level at low frequencies as would occur with a pair of subwoofers (8, 9) placed together in one corner of the room and driven in phase, thereby ensuring a constant sound pressure level along the lateral center line of the listening room at all audio frequencies.

IPC 1-7 (main, further and additional classification)

H03G 3/00; H04S 1/00

IPC 8 full level (invention and additional information)

H04R 3/12 (2006.01); H04S 1/00 (2006.01); H04S 7/00 (2006.01)

CPC (invention and additional information)

H04S 1/002 (2013.01); H04S 7/307 (2013.01)

Citation (search report)

Designated contracting state (EPC)

AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

EPO simple patent family

WO 9933173 A1 19990701; AU 2202299 A 19990712; EP 1042866 A1 20001011; EP 1042866 A4 20030618

INPADOC legal status


2008-09-24 [18D] DEEMED TO BE WITHDRAWN

- Effective date: 20080408

2007-06-27 [RTI1] TITLE (CORRECTION)

- Free text: SYSTEM FOR DRIVING SPEAKERS WITH A 90 DEGREE PHASE SHIFT

2003-06-18 [A4] DESPATCH OF SUPPLEMENTARY SEARCH REPORT

- Effective date: 20030507

2003-06-18 [RIC1] CLASSIFICATION (CORRECTION)

- IPC: 7H 03G 3/00 A

2003-06-18 [RIC1] CLASSIFICATION (CORRECTION)

- IPC: 7H 04S 1/00 B

2000-10-11 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20000720

2000-10-11 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE