(19)

(11)

EP 1 247 427 A2

(12)

(88) Date of publication A3: 14.03.2002 (43) Date of publication: 09.10.2002 Bulletin 2002/41 (21) Application number: 01900871.3 (22) Date of filing: 04.01.2001

(51) International Patent Classification (IPC)7: H04R 25/00, H04R 11/04 (86) International application number: PCT/US0100/227 (87) International publication number: WO 0105/2594 (19.07.2001 Gazette 2001/29)

(84) Designated Contracting States: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR Designated Extension States: AL LT LV MK RO SI (30) Priority: 07.01.2000 US 479134 (71) Applicant: Knowles Electronics, LLC Itasca, Illinois 60143 (US)	(72) Inventors: MILLER, Thomas, M. Arlington Heights, IL 60005 (US) MOSTARDO, August Norridge, IL 60706 (US) CARLSON, Elmer Glenview, IL 60025 (US) SCHAFER, David, E. Glen Ellyn, IL 60137 (US) (74) Representative: Dunlop, Brian Kenneth Charles et al c/o Wynne-Jones, Lainé & James22 Rodney Road CheltenhamGloucestershire GL50 1JJ CheltenhamGloucestershire GL50 1JJ (GB)