Feedback suppression using phase enhanced frequency estimation
US9307320B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 24, 2014 |
| Grant date | Apr 5, 2016 |
| Priority date | — |
| Expiry date | Aug 29, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R3/02
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A feedback suppression system for reducing acoustic feedback may include a controller configured to buffer a series of incoming digital sample signals to provide a plurality of buffered signals, the incoming digital sample signal being indicative of an audio input signal that includes audio data and acoustic feedback, determine a complex spectrum of the plurality of buffered signals, determine a magnitude squared spectrum from the complex spectrum, identify at least one peak in the magnitude squared spectrum, identify a frequency of the at least one identified peak using a phase enhanced frequency estimate, and set a notch filter at the identified frequency to eliminate the acoustic feedback of the audio input signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.