Directional microphone arrangement
Patent 4712244 Issued on December 8, 1987. Estimated Expiration Date: 
October 14, 2006. 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.
October 14, 2006. 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 References 2982942 Microphone for stereo reception Patent #: 4466117 InventorsAssigneeApplicationNo. 06/918497 filed on 10/14/1986US Classes:381/313, Directional381/120, WITH AMPLIFIER381/122, HAVING MICROPHONE381/327, Spectacle381/92DIRECTIVE CIRCUITS FOR MICROPHONESExaminersPrimary: Rubinson, Gene Z.Assistant: Byrd, Danita R. Attorney, Agent or FirmInternational ClassesH04R 25/02 (20060101)H04R 25/00 (20060101) Foreign Application Priority Data1985-10-16 DEAbstractA directional microphone arrangement has a number of discrete microphones each having an electrical output and elements for deriving first and second electrical signals which are 180° out of phase with respect to each other from the outputs of the microphones. A third signal is also derived through differentiation from one of the microphone outputs which is 90° out of phase with respect to one of the first or second signals. All of the first, second and third signals are added in a summing unit, the output of the summing unit forming the output for the arrangement.Other References
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