Communications – electrical: acoustic wave systems and devices – Distance or direction finding – With plurality of transducers
Reexamination Certificate
2007-01-16
2007-01-16
Pihulic, Daniel (Department: 3662)
Communications, electrical: acoustic wave systems and devices
Distance or direction finding
With plurality of transducers
C367S901000
Reexamination Certificate
active
11101170
ABSTRACT:
From output of a microphone, a first circuit generates a signal having first directivity which passes, and a second circuit generates a signal having second directivity which conversely cuts off, a signal arriving from a direction of a target sound source to output the obtained signals to a third circuit. Here, with two microphones disposed such that a noise source such as a speaker fails to locate at a position of a null of the second directivity, at the output of the second circuit, a signal arriving from the direction of the target sound source is cut off and a signal arriving from the direction of the noise source is passed. The third circuit corrects the output of the first circuit to output a signal with a signal arriving from the direction of the target sound source emphasized and a signal arriving from the direction of the noise source suppressed.
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Yoshifumi Nagata, et al., A Study of Noise Reduction Using Two-Channel Adaptive Beamformer, Acoustical Society of Japan Collected Papers, Toshiba Kansai Research Laboratories, Mar. 1997, Japan.
Osamu Hoshuyama, et al., A Robust Adaptive Beamformer With A Blocking Matrix Using Coefficient Constrained Adaptive Filters, Technical Report of the Institute of Electronics, Information and Communication Engineers, CS94-189, DSP94-111(1995-01), Japan.
Katten Muchin & Rosenman LLP
Pihulic Daniel
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