ACTIVE/PASSIVE HEADSET WITH SPEECH FILTER - Patent 0643880

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EP 0 643 880 A1

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(43)	Date of publication:
	22.03.1995 Bulletin 1995/12

(21)	Application number: 92912841.0

(22)	Date of filing: 05.06.1992

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International Patent Classification (IPC):

A61F 11/ 14^{( . )}

G10K 11/ 178^{( . )}

(86)	International application number:
	PCT/US1992/004568

(87)	International publication number:
	WO 1993/026085 (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
	Linthicum, MD 21090 (US)

(72)	Inventors:
	HOHMAN, John Towson, MD 21204 (US) EVANS, Robert Baltimore, MD 21234 (US) BUSCH, Ralph Takoma Park, MD 20912 (US) SCOTT, Roy Columbia, MD 21044 (US)

(74)	Representative: Wilhelm & Dauster Patentanwälte European Patent Attorneys
	Hospitalstrasse 8 D-70174 Stuttgart D-70174 Stuttgart (DE)

(54)	ACTIVE/PASSIVE HEADSET WITH SPEECH FILTER