(19)

(11)

EP 1 161 837 A1

(12)

(43) Date of publication: 12.12.2001 Bulletin 2001/50 (21) Application number: 00911056.0 (22) Date of filing: 16.03.2000

(51) International Patent Classification (IPC)7: H04N 7/18 (86) International application number: PCT/GB0000/989 (87) International publication number: WO 0056/074 (21.09.2000 Gazette 2000/38)

(84) Designated Contracting States: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE Designated Extension States: AL LT LV MK RO SI (30) Priority: 16.03.1999 GB 9906040 07.04.1999 GB 9907857 (71) Applicant: CENTRAL RESEARCH LABORATORIES LIMITED Hayes,Middlesex, UB3 1HH (GB)	(72) Inventor: YIN, Jia Hong London SW6 2RW (GB) (74) Representative: Sharp, Alan Cooper  QED I.P. Services Limited,Dawley Road Hayes,Middlesex UB3 1HH Hayes,Middlesex UB3 1HH (GB)