(19)

(11)

EP 0 563 088 A1

(12)

(43) Date of publication: 06.10.1993 Bulletin 1993/40 (21) Application number: 92900470.0 (22) Date of filing: 20.09.1991

(51) International Patent Classification (IPC):  G08B 5/ 22( . ) H04W 88/ 02( . ) H04N 1/ 00( . ) (86) International application number: PCT/US1991/006791 (87) International publication number: WO 1992/011615 (09.07.1992 Gazette 1992/17)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IT LI LU NL SE (30) Priority: 21.12.1990 US 19900632217 (71) Applicant: MOTOROLA, INC. Schaumburg, IL 60196 (US)	(72) Inventors: DAVIS, Walter, Lee Coral Springs, FL 33071 (US) WRIGHT, James, A. Coral Springs, FL 33065 (US) (74) Representative: Dunlop, Hugh Christopher, et al  Motorola, European Intellectual Property, Midpoint, Alencon Link Basingstoke, Hampshire RG21 7PL Basingstoke, Hampshire RG21 7PL (GB)