Communication system for videoconferencing
Patent 4650929 Issued on March 17, 1987. Estimated Expiration Date: 
February 28, 2005. 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.
February 28, 2005. 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 3705269 3718770 Video conferencing system using spatial reduction and temporal resolution Gain-adjusting conference circuit Television special effects arrangement Digital video effects system employing a chroma-key tracking technique Method and apparatus for controlling signal level in a digital conference arrangement Patent #: 4499578 InventorsAssigneeApplicationNo. 06/706718 filed on 02/28/1985US Classes:348/14.09Conferencing with multipoint control unitExaminersPrimary: George, Keith E.Attorney, Agent or FirmInternational ClassesH04N 7/15 (20060101)H04M 3/56 (20060101) Foreign Application Priority Data1984-02-29 DEAbstractA system for videoconferencing saves travel time and money. To enable participants to see each other continually and simultaneously, and to show documents and objects, equipment is needed, the costs of which vary with the number of locations to be interconnected, and with measures taken for reducing the needed transmission capacity and the outfit of each terminal. As in known videoconference systems, such as studio, or working place systems, the video and audio signals are switched and/or mixed in the inventive system. The necessary equipment, however, is no longer needed at the respective locations, if a central station for videoconferencing is provided which includes this equipment only in a volume actually necessary for the conference. Each of the connected participant locations only comprises terminal units, the same which are needed for a picture telephone system. In addition, both the video and the audio reception can individually be controlled from each location.Other References
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