The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 03, 2005
Filed:
Dec. 22, 1999
Jeff Vanden Berghe, Leuven, BE;
Jan Wouters, Holsbeek, BE;
Jeff Vanden Berghe, Leuven, BE;
Jan Wouters, Holsbeek, BE;
GN ReSound A/S, , DK;
Abstract
A noise reduction system for a sound reproduction system, in particular for hearing aids, comprises a primary and a secondary microphone for producing input signals in response to sound in which a noise component is present. The system has a first signal processing section comprising a fixed filter and a summing function, wherein the first signal processing section has means for receiving signals from the microphones and producing a speech reference signal and a noise reference signal. A second signal processing section comprises an adaptive filter and an additional summing function, and the second signal processing section has means for receiving the speech and noise reference signals and producing an output signal with an improved signal-to-noise ratio.