A communication path is established, only when monitoring a video signal on an object is required, between a sending station which acquires the video signal and a receiving station which monitors the acquired video signal through a display or the like. Usually, the video signal is monitored delayed by...http://www.google.com.au/patents/US5229850?utm_source=gb-gplus-sharePatent US5229850 - Video monitoring system including a memory for storing and transmitting a video signal immediately following the occurrence of an event
