(19)

(11)

EP 1 057 366 A1

(12)

(43) Date of publication: 06.12.2000 Bulletin 2000/49 (21) Application number: 99903210.5 (22) Date of filing: 20.01.1999

(51) International Patent Classification (IPC)7: H04R 5/00 (86) International application number: PCT/US9901/167 (87) International publication number: WO 9937/120 (22.07.1999 Gazette 1999/29)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IE IT LI SE (30) Priority: 20.01.1998 US 8993 (71) Applicants: Keller, Roger S. Berkeley, CA 94702 (US) Iredale, John J. Novato, CA 94948 (US)	(72) Inventors: Keller, Roger S. Berkeley, CA 94702 (US) Iredale, John J. Novato, CA 94948 (US) (74) Representative: McLeish, Nicholas Alistair Maxwell et al Boult Wade TennantVerulam Gardens70 Gray's Inn Road London WC1X 8BT London WC1X 8BT (GB)