Mh Acoustics, LLC

Edwards Lifesciences Corporation

Steven Backer

Gary Wayne Elko

Eric John Diethorn

Jens M Meyer

Michael J Higgins

Tomas Fritz Gaensler

Jennifer Wilbur

Tomas F Gaensler

Luong Ngoc Phan

In one embodiment, an audio processing system reduces reverberation in an audio signal. A first beamformer generates a first, directional beampattern, and a second beamformer generates a second beampattern. A signal-processing subsystem (i) processes the first and second beampatterns to generate suppression factors corresponding to the reverberation and (ii) applies the suppression factors to one of the first and second beampatterns to reduce the reverberation in the beampattern. In one implementation, the beampatterns are crossed-beam beampatterns, and the signal-processing subsystem generates the suppression factors based on coherence estimates for the beampatterns. In another implementation, the beampatterns are disjoint beampatterns, and the signal-processing subsystem generates the suppression factors based on short-time and long-time envelope estimates for the beampatterns. Depending on the implementation, the beamformers may be co-located with differently shaped beampatterns or non-co-located with differently or equally shaped beampatterns.

Reverberation suppression using multiple beamformers

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Oakland, CA, United States of America

Steven Backer