In a multipoint videoconferencing system including a plurality of visual telephone terminals and a multipoint control unit (MCU) connected thereto, shares of the respective visual telephone terminals are determined in the MCU, based on determination of a speaker determined from voice levels and/or...http://www.google.com/patents/US5684527?utm_source=gb-gplus-sharePatent US5684527 - Adaptively controlled multipoint videoconferencing system
