(19)

(11)

EP 0 151 171 A1

(12)

(43) Date of publication: 14.08.1985 Bulletin 1985/33 (21) Application number: 84902928.0 (22) Date of filing: 27.07.1984

(51) International Patent Classification (IPC):  H04N 5/ 765( . ) (86) International application number: PCT/GB1984/000262 (87) International publication number: WO 1985/000717 (14.02.1985 Gazette 1985/04)

(84) Designated Contracting States: AT BE CH DE FR GB LI LU NL SE (30) Priority: 27.07.1983 GB 19830020192 (71) Applicant: LAVEY/WOLFF/SWIFT LIMITED London W2 4LA (GB)	(72) Inventor: FULLARTON, John, Richard London W2 4LA (GB) (74) Representative: Jones, Ian  W.P. THOMPSON & CO. Celcon House 289-293 High Holborn London WC1V 7HU London WC1V 7HU (GB)