(19)

(11)

EP 1 070 437 A1

(12)

(43) Date of publication: 24.01.2001 Bulletin 2001/04 (21) Application number: 99914672.3 (22) Date of filing: 06.04.1999

(51) International Patent Classification (IPC)7: H04R 1/02 (86) International application number: PCT/GB9901/048 (87) International publication number: WO 9952/322 (14.10.1999 Gazette 1999/41)

(84) Designated Contracting States: AT BE CH DE DK ES FI FR GB IE IT LI NL PT SE Designated Extension States: RO SI (30) Priority: 07.04.1998 GB 9807316 (71) Applicant: New Transducers Limited London SW3 3QH (GB)	(72) Inventors: AZIMA, Henry Chaucer RoadCambridge CB2 2TT (GB) PANZER, Joerg HuntingdonCambridgeshire PE18 6UE (GB) (74) Representative: Maguire, Peter Albert  Maguire Boss,5 Crown Street St. Ives,Cambridgeshire PE27 5EB St. Ives,Cambridgeshire PE27 5EB (GB)