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:
Apr. 01, 2014
Filed:
Sep. 30, 2008
Hearing aid system with feedback arrangement to predict and cancel acoustic feedback, method and use
Thomas BO Elmedyb, Smørum, DK;
Johan Hellgren, Linköping, SE;
Thomas Bo Elmedyb, Smørum, DK;
Johan Hellgren, Linköping, SE;
Oticon A/S, Smorum, DK;
Abstract
A hearing aid system includes an input transducer, an output transducer, and an electrical signal path between them. The signal path includes a signal processing unit. An electrical feedback cancellation path is formed between the output side and the input side of the signal path and subtracts an estimate of acoustical feedback from a signal on the input side of the amplifier part, the electrical feedback cancellation path including an adaptive filter for providing a variable filtering function. A probe signal generator generates a probe signal characterizing an acoustical feedback path, the probe signal being fed to the adaptive filter of the electrical feedback cancellation path. A second input transducer is located at a position where the acoustical signal is substantially free from acoustic feedback from the output transducer, and the adaptive filter uses a signal derived from the second electrical input signal to influence its filtering function.