Calibration of microphone arrays with an uncalibrated source
US10880645B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 28, 2020 |
| Grant date | Dec 29, 2020 |
| Priority date | — |
| Expiry date | Feb 28, 2040 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R2410/03
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Microphone array calibration that does not require a calibrated source or calibrated reference microphone is provided. We provide a statistical (Bayesian) algorithm that (under condition of reasonable environment noise during calibration) can determine gain and phase differences of a whole array at once, even when the gain and/or phase of the source is unknown. More specifically, a Bayesian regression with complex log-normal prior and complex normal likelihood is employed. The inherent phase-wrapping ambiguity in this regression is resolved by exploiting the similarity of likelihood between a lattice point and its Euclidean Voronoi region.
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