Patent
Beamforming pre-processing for speaker localization
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TLDR
In this paper, a first plurality of microphone signals is generated by a first beamformer comprising beamforming weights to obtain the first beamformed signal, and a second plurality of signal is generated using a second beamformer.Abstract:
Embodiments of the present invention relate to methods, systems, and computer program products for signal processing. A first plurality of microphone signals is obtained by a first microphone array. A second plurality of microphone signals is obtained by a second microphone array different from the first microphone array. The first plurality of microphone signals is beamformed by a first beamformer comprising beamforming weights to obtain a first beamformed signal. The second plurality of microphone signals is beamformed by a second beamformer comprising the same beamforming weights as the first beamformer to obtain a second beamformed signal. The beamforming weights are adjusted such that the power density of echo components and/or noise components present in the first and second plurality of microphone signals is substantially reduced.read more
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Patent
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TL;DR: In this article, the authors proposed a method to obtain a plurality of virtual microphone audio channels with at least one voice channel and one noise channel by adjusting the corresponding voice beamform.
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References
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Journal ArticleDOI
Adaptive noise cancelling: Principles and applications
Bernard Widrow,J.R. Glover,John M. McCool,J. Kaunitz,C.S. Williams,R.H. Hearn,James R. Zeidler,Jr. Eugene Dong,R.C. Goodlin +8 more
TL;DR: It is shown that in treating periodic interference the adaptive noise canceller acts as a notch filter with narrow bandwidth, infinite null, and the capability of tracking the exact frequency of the interference; in this case the canceller behaves as a linear, time-invariant system, with the adaptive filter converging on a dynamic rather than a static solution.
Journal ArticleDOI
Beamforming: a versatile approach to spatial filtering
B.D. Van Veen,K.M. Buckley +1 more
TL;DR: An overview of beamforming from a signal-processing perspective is provided, with an emphasis on recent research.
Journal ArticleDOI
An alternative approach to linearly constrained adaptive beamforming
L.J. Griffiths,C. Jim +1 more
TL;DR: A beamforming structure is presented which can be used to implement a wide variety of linearly constrained adaptive array processors and is shown to incorporate algorithms which have been suggested previously for use in adaptive beamforming as well as to include new approaches.
Journal ArticleDOI
A robust adaptive beamformer for microphone arrays with a blocking matrix using constrained adaptive filters
TL;DR: The proposed beamformer is shown to be robust to target-direction errors as large as 200 with almost no degradation in interference-reduction performance, and it can be implemented with several microphones.
Journal ArticleDOI
Blind Acoustic Beamforming Based on Generalized Eigenvalue Decomposition
Ernst Warsitz,M.R. Haeb-Umbach +1 more
TL;DR: It is shown how the distortion of the desired signal can be controlled by a single-channel post-filter, resulting in a performance comparable to the generalized minimum variance distortionless response beamformer, where arbitrary transfer functions relate the source and the microphones.