(19)

(11)

EP 0 465 542 A1

(12)

(43) Date of publication: 15.01.1992 Bulletin 1992/03 (21) Application number: 90905582.0 (22) Date of filing: 05.04.1990

(51) International Patent Classification (IPC):  H04M 11/ 00( . ) H04N 7/ 173( . ) (86) International application number: PCT/GB1990/000518 (87) International publication number: WO 1990/012473 (18.10.1990 Gazette 1990/24)

(84) Designated Contracting States: DE ES FR IT NL (30) Priority: 06.04.1989 GB 19890007725 (71) Applicant: BYTEX INTERNATIONAL CORPORATION LIMITED Staines, Middlesex TW18 4NN (GB)	(72) Inventors: BRUETON, Peter, Mark Bracknell Berkshire RG12 3TX (GB) WOOLLARD, David, Edward Hertfordshire EN7 6AZ (GB) (74) Representative: Beresford, Keith Denis Lewis  BERESFORD & Co. 2-5 Warwick Court High Holborn London WC1R 5DJ London WC1R 5DJ (GB)