Electrical audio signal processing systems and devices – Directive circuits for microphones
Reexamination Certificate
2004-09-16
2009-12-08
Chin, Vivian (Department: 2614)
Electrical audio signal processing systems and devices
Directive circuits for microphones
C381S094100, C381S122000
Reexamination Certificate
active
07630502
ABSTRACT:
A method of designing a beamformer, and a beamformer made in accordance with this method, characterized by a uniform speakerphone response condition, resulting in optimal beamforming directivity under a uniform coupling constraint. According to the present invention, a finite number of individual beamformers are constrained to have the same response to a loudspeaker signal (as well as the same gain in their respective look directions) without specifying the exact value of their response to this signal. This results in beamformer weights that are optimal in the minimum variance sense and satisfy the uniform coupling constraint. The minimum variance condition combines all beamformer weights at once, and the uniform coupling constraint is expressed as a finite number of linear constraints on the weights of the individual beamformers, without specifying an arbitrary, a priori value for the actual value of the uniform response.
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Beaucoup Franck
Tetelbaum Michael
Chin Vivian
Mitel Networks Corporation
Olaniran Fatimat O
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