Selective notch filtering for howling suppression
US8891786B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 6, 2011 |
| Grant date | Nov 18, 2014 |
| Priority date | — |
| Expiry date | Jan 26, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M9/082
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Systems, methods, and other embodiments associated with selective notch filtering for howling suppression are described. According to one embodiment, an apparatus includes a howling detector that detects howling by performing a time domain analysis of speech signals to identify a speech signal that may be exhibiting howling and performing frequency domain analysis to confirm that the speech signal is exhibiting howling. The apparatus also includes a suppression selector configured to select a suppression technique, a signal processor configured to process the speech signal according to a selected suppression technique. The apparatus outputs, without suppression-related processing, speech signals that are not identified based on the time domain analysis. In another embodiment a method includes analyzing a speech signal to detect howling and when howling is detected, selecting, based on the howling analysis, a howling suppression technique from a set of howling suppression techniques that includes at least two different howling suppression techniques.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.