Directional microphone system
Patent 6137887 Issued on October 24, 2000. Estimated Expiration Date: 
September 16, 2017. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
September 16, 2017. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesSound actuated microphone system Microphone actuation control system suitable for teleconference systems Patent #: 4658425 InventorAssigneeApplicationNo. 931032 filed on 09/16/1997US Classes:381/92, DIRECTIVE CIRCUITS FOR MICROPHONES381/81, With switching381/111, CIRCUITRY COMBINED WITH SPECIFIC TYPE MICROPHONE OR LOUDSPEAKER381/356DirectionalExaminersPrimary: Le, HuyenAttorney, Agent or FirmInternational ClassH04R 025/00AbstractA multiple-microphone actuation control system using direction-sensitive microphones turns ON microphones only if a talker's speech originates from within a specified "acceptance angle" in front of the microphones. Additionally, the invention automatically identifies which microphone best "hears" the talker, and only turns ON one microphone per talker, while allowing several microphones to turn ON simultaneously for several talkers.Other References
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