Real-time detection of feedback instability
US10244306B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 24, 2018 |
| Grant date | Mar 26, 2019 |
| Priority date | — |
| Expiry date | May 24, 2038 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R2460/01
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Audio systems and methods are provided that detect instability in active feedback noise reduction circuitry. An acoustic transducer converts a driver signal into an acoustic signal, and a microphone provides a feedback signal. The feedback signal is processed, through a first transfer function, to provide an anti-noise signal. The driver signal is based at least in part upon the anti-noise signal, to reduce acoustic noise in the environment of the acoustic transducer. The driver signal is also filtered by a filter having a second transfer function that is inverse of the first transfer function, to provide a reference signal. The feedback signal is compared to the reference signal to determine a feedback instability, based upon the comparison.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.