Reducing noise in audio systems
US7171008B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 12, 2002 |
| Grant date | Jan 30, 2007 |
| Priority date | — |
| Expiry date | Nov 10, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R2430/21
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Two or more microphones receive acoustic signals and generate audio signals that are processed to determine what portion of the audio signals result from (i) incoherence between the audio signals and/or (ii) audio-signal sources having propagation speeds different from the acoustic signals. The audio signals are filtered to reduce that portion of one or more of the audio signals. The present invention can be used to reduce turbulent wind-noise resulting from wind or other airjets blowing across the microphones. Time-dependent phase and amplitude differences between the microphones can be compensated for based on measurements made in parallel with routine audio system processing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.