(19)

(11)

EP 0 847 660 A2

(12)

(43) Date of publication: 17.06.1998 Bulletin 1998/25 (21) Application number: 96929389.0 (22) Date of filing: 02.09.1996

(51) International Patent Classification (IPC):  B42D 15/ 02( . ) H04R 1/ 02( . ) H04R 17/ 00( . ) H04R 1/ 00( . ) H04R 7/ 06( . ) H04R 7/ 04( . ) (86) International application number: PCT/GB1996/002144 (87) International publication number: WO 1997/009841 (13.03.1997 Gazette 1997/12)

(84) Designated Contracting States: AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE Designated Extension States: AL LT LV SI (30) Priority: 02.09.1995 GB 19950017918 31.10.1995 GB 19950022281 30.03.1996 GB 19960006836 (71) Applicant: New Transducers Limited Huntingdon, Cambridgeshire PE18 6ED (GB)	(72) Inventors: AZIMA, Henry Cambridge CB2 2TT (GB) COLLOMS, Martin London NW2 2DA (GB) HARRIS, Neil Great Shelford Cambridge CB2 5JF (GB) (74) Representative: Maguire, Peter Albert, et al  Maguire Boss, 5 Crown Street St. Ives, Cambridgeshire PE17 4EB St. Ives, Cambridgeshire PE17 4EB (GB)