(19)

(11)

EP 0 956 736 A2

(12)

(43) Date of publication: 17.11.1999 Bulletin 1999/46 (21) Application number: 98902117.0 (22) Date of filing: 30.01.1998

(51) International Patent Classification (IPC):  H04R 9/ 02( . ) H04R 9/ 06( . ) H04R 7/ 04( . ) H04R 9/ 04( . ) H04R 11/ 02( . ) H04R 7/ 16( . ) (86) International application number: PCT/GB1998/000307 (87) International publication number: WO 1998/034320 (06.08.1998 Gazette 1998/31)

(84) Designated Contracting States: AT BE CH DE DK ES FI FR GB IE IT LI NL PT SE Designated Extension States: LT LV RO SI (30) Priority: 31.01.1997 GB 19970001983 (71) Applicant: New Transducers Limited Huntingdon, Cambridgeshire PE18 6ED (GB)	(72) Inventors: AZIMA, Henry Cambridge CB2 2TT (GB) ROBERTS, Martin Bury St. Edmunds Suffolk IP3 2QJ (GB) JARVIS, Edward Bluntisham Cambridgeshire PE17 3LF (GB) (74) Representative: Maguire, Peter Albert, et al  Maguire Boss, 5 Crown Street St. Ives, Cambridgeshire PE17 4EB St. Ives, Cambridgeshire PE17 4EB (GB)