(19)

(11)

EP 0 229 759 A1

(12)

(43) Date of publication: 29.07.1987 Bulletin 1987/31 (21) Application number: 85905070.0 (22) Date of filing: 07.10.1985

(51) International Patent Classification (IPC):  H04N 7/ 18( . ) (86) International application number: PCT/GB1985/000451 (87) International publication number: WO 1986/002224 (10.04.1986 Gazette 1986/08)

(84) Designated Contracting States: AT BE CH DE FR IT LI NL SE (30) Priority: 05.10.1984 GB 19840025239 (71) Applicant: SUPERSCREEN LIMITED Berkeley Square London W1X 7PB (GB)	(72) Inventor: WILLIAMS, David, Owen London W1X 7PB (GB) (74) Representative: Cole, Paul Gilbert  HUGHES CLARK & CO. 63 Lincoln's Inn Fields London WC2A 3JU London WC2A 3JU (GB)