(19)

(11)

EP 1 032 998 A1

(12)

(43) Date of publication: 06.09.2000 Bulletin 2000/36 (21) Application number: 98926519.4 (22) Date of filing: 09.06.1998

(51) International Patent Classification (IPC)7: H04H 9/00 (86) International application number: PCT/US9812/034 (87) International publication number: WO 9927/668 (03.06.1999 Gazette 1999/22)

(84) Designated Contracting States: CH DE ES FR GB IT LI (30) Priority: 20.11.1997 US 974699 (71) Applicant: Nielsen Media Research, Inc. New York,New York 10171-0074 (US)	(72) Inventors: LU, Daozheng Dunedin, FL 34698 (US) HARKNESS, David, H. Wilton, CT 06897 (US) PRICE, Gordon, R. Pass-A-Grille Beach, FL 33741-6413 (US) (74) Representative: Lawrence, John et al Barker Brettell 138 Hagley RoadEdgbaston Birmingham B16 9PW Birmingham B16 9PW (GB)