(19)

(11)

EP 0 645 004 A1

(12)

(43) Date of publication: 29.03.1995 Bulletin 1995/13 (21) Application number: 92913860.0 (22) Date of filing: 10.06.1992

(51) International Patent Classification (IPC):  G10K 11/ 178( . ) (86) International application number: PCT/US1992/004574 (87) International publication number: WO 1993/025879 (23.12.1993 Gazette 1993/30)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IT LI LU MC NL SE (71) Applicant: NOISE CANCELLATION TECHNOLOGIES, INC. Linthicum, MD 21090 (US)	(72) Inventor: GOSSMAN, William Arlington, VA 22209 (US) (74) Representative: Wilhelm & Dauster Patentanwälte European Patent Attorneys  Hospitalstrasse 8 D-70174 Stuttgart D-70174 Stuttgart (DE)