(19)

(11)

EP 0 667 093 A1

(12)

(43) Date of publication: 16.08.1995 Bulletin 1995/33 (21) Application number: 93923007.0 (22) Date of filing: 15.10.1993

(51) International Patent Classification (IPC):  H04R 11/ 00( . ) H04R 25/ 00( . ) H04R 11/ 02( . ) (86) International application number: PCT/GB1993/002140 (87) International publication number: WO 1994/010817 (11.05.1994 Gazette 1994/11)

(84) Designated Contracting States: BE CH DE DK FR GB IE LI NL (30) Priority: 29.10.1992 GB 19920022677 (60) Divisional application: 97100314.0 /  (60) Divisional application: 97103200.8 / 0784415 (60) Divisional application: 99102640.2 / 0924961 (71) Applicant: Knowles Electronics Company Burgess Hill Sussex RH15 9LP (GB)	(72) Inventors: SALVAGE, Richard, James West Sussex RH15 0NL (GB) HARRINGTON, Steven, John West Sussex BN44 3WE (GB) (74) Representative: Dunlop, Brian Kenneth Charles, et al  c/o Wynne-Jones, Lainé & James 22 Rodney Road Cheltenham Gloucestershire GL50 1JJ Cheltenham Gloucestershire GL50 1JJ (GB)