Apparatus and method for adaptive signal characterization and noise reduction in hearing aids and other audio devices
US7558636B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 21, 2002 |
| Grant date | Jul 7, 2009 |
| Priority date | — |
| Expiry date | Jun 20, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L2021/065
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A system and method for characterizing the contents of an input audio signal and for suppressing noise components of the input audio signal are described. The audio signal is divided into a number of frequency domain input signals. Each frequency domain input signal can be processed separately to determine its intensity change, modulation frequency, and time duration characteristics to characterize the frequency domain input signal as containing a desirable signal or as a type of noise. An index signal is calculated based on a combination of the determined characteristics and signals identified as noise are suppressed in comparison to signals identified as desirable to produce a set of frequency domain output signals with reduced noise. The frequency domain output signals are combined to provide an output audio signal corresponding to the input audio signal but having suppressed noise components and comparatively enhanced desirable signal components.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.