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:
Jan. 15, 2002
Filed:
Feb. 26, 2001
Henning Hougaard Andersen, Hørsholm, DK;
Carl Ludvigsen, Valby, DK;
Topholm & Westermann APS, Vaerlose, DK;
Abstract
A hearing aid with beam forming properties, having at least two microphone channels ( ) for at least two microphones ( ), the microphone channels each comprising an analog to digital converter ( ) and having at least one programmable or program controlled signal processor ( ), as well as a digital to analog converter, and at least one receiver and a battery for power supply. The hearing aid particularly comprises in each microphone channel ( ) a sigma-delta-type analog to digital converter ( ) including a digital low pas filter and a decimator ) for converting a 1 Bit Stream of a high clock frequency into a digital word sequence of a lower clock frequency. At least one of the at least two microphone channels contains a controllable delay device ( ) connected to the input side of the respective digital low pass filter and decimator ( ) of the channel, the delay device ( ) being controllable by the at least one signal processor ( ). The delay device is preferably integrated into the sigma-delta-ADC ( ).