Speech recognition using microphone antenna array
US6937980B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 2, 2001 |
| Grant date | Aug 30, 2005 |
| Priority date | — |
| Expiry date | Apr 30, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L2021/02168
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A system and method of audio processing provides enhanced speech recognition. Audio input is received at a plurality of microphones. The multi-channel audio signal from the microphones may be processed by a beamforming network to generate a single-channel enhanced audio signal, on which voice activity is detected. Audio signals from the microphones are additionally processed by an adaptable noise cancellation filter having variable filter coefficients to generate a noise-suppressed audio signal. The variable filter coefficients are updated during periods of voice inactivity. A speech recognition engine may apply a speech recognition algorithm to the noise-suppressed audio signal and generate an appropriate output. The operation of the speech recognition engine and the adaptable noise cancellation filter may advantageously be controlled based on voice activity detected in the single-channel enhanced audio signal from the beamforming network.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.