Multi-microphone source tracking and noise suppression
US9338551B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 17, 2014 |
| Grant date | May 10, 2016 |
| Priority date | — |
| Expiry date | May 28, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R2430/25
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Methods, systems, and apparatuses are described for improved multi-microphone source tracking and noise suppression. In multi-microphone devices and systems, frequency domain acoustic echo cancellation is performed on each microphone input, and microphone levels and sensitivity are normalized. Methods, systems, and apparatuses are also described for improved acoustic scene analysis and source tracking using steered null error transforms, on-line adaptive acoustic scene modeling, and speaker-dependent information. Switched super-directive beamforming reinforces desired audio sources and closed-form blocking matrices suppress desired audio sources based on spatial information derived from microphone pairings. Underlying statistics are tracked and used to updated filters and models. Automatic detection of single-user and multi-user scenarios, and single-channel suppression using spatial information, non-spatial information, and residual echo are also described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.