Method and apparatus for noise suppression in a small array microphone system
US8068619B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 5, 2007 |
| Grant date | Nov 29, 2011 |
| Priority date | — |
| Expiry date | Aug 31, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L25/78
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A small array microphone system includes an array microphone having a plurality of microphones and operative to provide a plurality of received signals, each microphone providing one received signal. A first voice activity detector (VAD) provides a first voice detection signal generated using the plurality of received signals to indicate the presence or absence of in-beam desired speech. A second VAD provides a second voice detection signal generated using the plurality of received signals to indicate the presence or absence of out-of-beam noise when in-beam desired speech is absent. A reference signal generator provides a reference signal based on the first voice detection signal, the plurality of received signals, and a beamformed signal, wherein the reference signal has the desired speech suppressed. A beamformer provides the beamformed signal based on the second voice detection signal, the reference signal, and the plurality of received signals, wherein the beamformed signal has noise suppressed. A multi-channel noise suppressor operative to further suppress noise in the beamformed signal and provide an output signal. A speech reliability detector provides a reliability detecti…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.