(19)

(11)

EP 0 186 671 A1

(12)

(43) Date of publication: 09.07.1986 Bulletin 1986/28 (21) Application number: 85902424.0 (22) Date of filing: 06.06.1985

(51) International Patent Classification (IPC):  G10L 15/ 20( . ) G10L 15/ 04( . ) H04B 1/ 46( . ) G10L 11/ 02( . ) G10L 21/ 02( . ) H04R 3/ 00( . ) (86) International application number: PCT/AU1985/000121 (87) International publication number: WO 1986/000133 (03.01.1986 Gazette 1986/01)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 08.06.1984 AU 19840005422 (71) Applicant: PLESSEY AUSTRALIA PTY. LIMITED Meadowbank, NSW 2114 (AU)	(72) Inventor: SPALDING, David Castle Hill, NSW 2154 (AU) (74) Representative: Geldard, David Guthrie, et al  URQUHART-DYKES AND LORD Tower House Merrion Way Leeds West Yorkshire LS2 8PA Leeds West Yorkshire LS2 8PA (GB)