Rejecting noise with paired microphones
US8620650B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 1, 2011 |
| Grant date | Dec 31, 2013 |
| Priority date | — |
| Expiry date | Jun 6, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R2410/07
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A system for combining signals includes a first microphone generating a first input signal having a first voice component and a first noise component, a second microphone generating a second input signal having a second voice component and a second noise component, a mixing circuit, and an adaptive filter. The mixing circuit applies a first gain having a value α to the first input signal to produce a first scaled signal, applies a second gain having a value 1−α to the second input signal to produce a second scaled signal, and sums the first scaled signal and the second scaled signal to produce a summed signal. The adaptive filter computes an updated value of α to minimize the energy of the summed signal based on the summed signal, the first input signal and the second input signal, and provides the updated value of α to the mixing circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.