Title:
REDUCING NOISE IN AUDIO SYSTEMS
Document Type and Number:
WIPO Patent Application WO2003067922
Kind Code:
A3
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.
Inventors:
ELKO GARY W
Application Number:
PCT/US2003/003476
Publication Date:
March 11, 2004
Filing Date:
February 05, 2003
Export Citation:
Assignee:
MH ACOUSTICS LLC (US)
International Classes:
H04R3/00; H04R25/00; (IPC1-7): H04R3/00
Domestic Patent References:
| WO1995016259A1 | 1995-06-15 |
Foreign References:
| US5602962A | 1997-02-11 |
Other References:
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 22 9 March 2001 (2001-03-09)
PATENT ABSTRACTS OF JAPAN vol. 1995, no. 01 28 February 1995 (1995-02-28)
PATENT ABSTRACTS OF JAPAN vol. 1995, no. 01 28 February 1995 (1995-02-28)
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