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:
Aug. 07, 2001
Filed:
Dec. 08, 1999
Lars Baekgaard, Farum, DK;
Topholm & Westermann APS, Vaerloese, DK;
Abstract
Hearing aid with a controllable directional characteristic having at least two spaced apart microphones (Mic,Mic,) in at least two microphone channels, at least one signal processing unit, at least one output transducer and a directional controlling system, with means for adaptively matching the characteristics of at least two microphones. This novel hearing aid comprises an adaptive phase matching circuit (,), inserted into said at least two microphone channels, the adaptive phase matching circuit, (,) having its outputs connected to an acoustical delay compensation means (,), followed by a parameter control circuit (,), the output of which is applied to a controllable filter means (,) inserted into at least one of said at least two microphone channels inside said adaptive phase matching circuit. Preferably filter means (,) are provided in front of said acoustical delay compensation means (,), which could be used to eliminate DC components.