(19)

(11)

EP 1 000 526 A2

(12)

(88) Date of publication A3: 22.04.1999 (43) Date of publication: 17.05.2000 Bulletin 2000/20 (21) Application number: 98933150.9 (22) Date of filing: 07.07.1998

(51) International Patent Classification (IPC)7: H04R 25/02, H04R 25/00 (86) International application number: PCT/US9813/890 (87) International publication number: WO 9907/182 (11.02.1999 Gazette 1999/06)

(84) Designated Contracting States: CH DE DK FR GB LI (30) Priority: 29.07.1997 US 902401 (71) Applicant: DECIBEL INSTRUMENTS, INC. Fremont, CA 94555 (US)	(72) Inventors: SHENNIB, Adnan Fremont, CA 94555 (US) FLETCHER, Henry Cameron Park, CA 95682 (US) (74) Representative: Diehl, Hermann, Dr. Dipl.-Phys. et al DIEHL, GLÄSER, HILTL & PARTNERPatentanwälteAugustenstrasse 46 80333 München 80333 München (DE)