Beam rejection in multi-beam microphone systems
US10746840B1 · kind B1 · utility
47Cited by
6References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 22, 2017 |
| Grant date | Aug 18, 2020 |
| Priority date | — |
| Expiry date | May 22, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R2499/11
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The systems, devices, and processes described herein may identify a beam of a voice-controlled device that is directed toward a reflective surface, such as a wall. The beams may be created by a beamformer. An acoustic echo canceller (AEC) may create filter coefficients for a reference sound. The filter coefficients may be analyzed to identify beams that include multiple peaks. The multiple peaks may indicate presence of one or more reflective surfaces. Using the amplitude and the time delay between the peaks, the device may determine that it is close to a reflective surface in a direction of the beam.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.