(19)

(11)

EP 0 981 928 A2

(12)

(88) Date of publication A3: 18.02.1999 (43) Date of publication: 01.03.2000 Bulletin 2000/09 (21) Application number: 98921596.7 (22) Date of filing: 13.05.1998

(51) International Patent Classification (IPC)7: H04R 7/06 (86) International application number: PCT/GB9801/362 (87) International publication number: WO 9852/381 (19.11.1998 Gazette 1998/46)

(84) Designated Contracting States: AT BE DE DK ES FI FR GB IE IT NL PT SE (30) Priority: 15.05.1997 GB 9709959 (71) Applicant: New Transducers Limited London SW3 3QH (GB)	(72) Inventors: AZIMA, Henry Chaucer Road,Cambridge CB2 2TT (GB) ELLIS, Christien Great Chishill,Hertfordshire SG8 8SB (GB) HARRIS, Neil 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)