Audio capture using beamforming
US10887691B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 28, 2017 |
| Grant date | Jan 5, 2021 |
| Priority date | — |
| Expiry date | Dec 28, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R2430/20
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An audio capture apparatus comprises a microphone array (301) and a beamformer (303) arranged to generate a beamformed audio output signal and a noise reference signal. A first and second transformer (309, 311) generates a first and second frequency domain signal from a frequency transform of the beamformed audio output signal and noise reference signal respectively. A difference processor (313) generates time frequency tile difference measures which for a given frequency is indicative of a difference between a monotonic function of a norm (magnitude) of a time frequency tile value of the first frequency domain signal and a monotonic function of a norm of a time frequency tile value of the second frequency domain signal for the first frequency. An estimator (315) generates an estimate indicative of whether the audio output signal comprises a point audio source in response to a combined difference value for time frequency tile difference measures for frequencies above a frequency threshold.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.