(19)

(11)

EP 0 215 065 A1

(12)

(43) Date of publication: 25.03.1987 Bulletin 1987/13 (21) Application number: 86901680.0 (22) Date of filing: 17.02.1986

(51) International Patent Classification (IPC):  G10L 15/ 10( . ) G10L 19/ 00( . ) G10L 17/ 00( . ) (86) International application number: PCT/US1986/000373 (87) International publication number: WO 1986/005618 (25.09.1986 Gazette 1986/21)

(84) Designated Contracting States: BE DE FR GB IT NL SE (30) Priority: 21.03.1985 US 19850714524 (71) Applicant: AT&T Corp. New York, NY 10013-2412 (US)	(72) Inventors: RABINER, Lawrence, Richard Berkeley Heights, NJ 07922 (US) ROSENBERG, Aaron, Edward Berkeley Heights, NJ 07922 (US) SOONG, Frank, Kao-Ping Fanwood, NJ 07023 (US) (74) Representative: Watts, Christopher Malcolm Kelway, Dr., et al  AT&T (UK) Ltd. 5, Mornington Road Woodford Green Essex, IG8 0TU Woodford Green Essex, IG8 0TU (GB)