(19)

(11)

EP 0 654 158 A1

(12)

(43) Date of publication: 24.05.1995 Bulletin 1995/21 (21) Application number: 93917104.0 (22) Date of filing: 14.07.1993

(51) International Patent Classification (IPC):  G06F 15/ 16( . ) G06F 15/ 80( . ) (86) International application number: PCT/US1993/006524 (87) International publication number: WO 1994/003852 (17.02.1994 Gazette 1994/05)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IE IT LI NL PT SE (30) Priority: 05.08.1992 US 19920926265 (71) Applicant: DAVID SARNOFF RESEARCH CENTER, INC. Princeton, NJ 08543-5300 (US)	(72) Inventors: CHIN, Danny Princeton Junction, NJ 08440 (US) PETERS, Joseph, Edward, Jr. East Brunswick, NJ 08816 (US) TAYLOR, Herbert, Hudson, Jr. Pennington, NJ 08534 (US) (74) Representative: Harris, Ian Richard  c/o D. Young & Co., 21 New Fetter Lane London EC4A 1DA London EC4A 1DA (GB)