EP 1042866 A1 20001011 - SYSTEM FOR DRIVING SPEAKERS WITH A 90 DEGREE PHASE SHIFT
Title (en)
SYSTEM FOR DRIVING SPEAKERS WITH A 90 DEGREE PHASE SHIFT
Title (de)
VORRICHTUNG ZUM TREIBEN VON LAUTSPRECHERN MIT EINER 90 GRADPHASENVERSCHIEBUNG
Title (fr)
SYSTEME DE HAUT-PARLEUR A DECALAGE DE PHASE DE 90 DEGRES
Publication
Application
Priority
- US 9827174 W 19981221
- US 6871697 P 19971223
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
IPC 8 full level
H04R 3/12 (2006.01); H04S 1/00 (2006.01); H04S 7/00 (2006.01)
CPC (source: EP)
H04S 1/002 (2013.01); H04S 7/307 (2013.01)
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
WO 9933173 A1 19990701; AU 2202299 A 19990712; EP 1042866 A1 20001011; EP 1042866 A4 20030618
DOCDB simple family (application)
US 9827174 W 19981221; AU 2202299 A 19981221; EP 98966031 A 19981221