Adaptive beamformer using a log domain optimization criterion
US8401206B2 · kind B2 · utility
21Cited by
5References
20Claims
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Key dates
| Filing date | Jan 15, 2009 |
| Grant date | Mar 19, 2013 |
| Priority date | — |
| Expiry date | Aug 29, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R3/005
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Described is a audio signal processing technology in which an adaptive beamformer processes input signals from microphones based on an estimate received from a pre-filter. The adaptive beamformer may compute its parameters (e.g., weights) for each frame based on the estimate, via a magnitude-domain objective function or log-magnitude-domain objective function. The pre-filter may include a time invariant beamformer and/or a non-linear spatial filter, and/or may include a spectral filter. The computed parameters may be adjusted based on a constraint, which may be selectively applied only at desired times.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.