Hearing aid system with feedback arrangement to predict and cancel acoustic feedback, method and use
US8687832B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 30, 2008 |
| Grant date | Apr 1, 2014 |
| Priority date | — |
| Expiry date | Feb 12, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R25/453
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.