(19)

(11)

EP 0 953 275 A1

(12)

(43) Date of publication: 03.11.1999 Bulletin 1999/44 (21) Application number: 97912313.0 (22) Date of filing: 11.11.1997

(51) International Patent Classification (IPC):  H04R 7/ 06( . ) H04R 17/ 00( . ) H04R 1/ 40( . ) H04R 7/ 20( . ) H04R 1/ 26( . ) (86) International application number: PCT/GB1997/003090 (87) International publication number: WO 1998/028942 (02.07.1998 Gazette 1998/26)

(84) Designated Contracting States: AT BE CH DE ES FR GB IT LI NL SE (30) Priority: 20.12.1996 GB 19960026439 09.01.1997 GB 19970000336 (71) Applicant: NCT Group, Inc. Linthicum, MD 21090-1206 (US)	(72) Inventors: DAVIS, Gillian, Margaret Cambridgeshire PE17 4UJ (GB) LUNDIE, Thomas Cambridgeshire PE19 3PJ (GB) MCDONALD, Anthony, Malcolm Cambridgeshire PE17 3PN (GB) (74) Representative: Targett, Kenneth Stanley  48 Meadowsweet Way Horton Heath, Hampshire SO50 7PD Horton Heath, Hampshire SO50 7PD (GB)