A video receiving device (A) that includes a circuit for receiving first video signals from a remote transmitter, a circuit for receiving second video signals from another video receiver (TVS), a circuit (TU1) for automatic searching for transmission channels, and a circuit (PC) for phase comparison...http://www.google.fr/patents/US5956097?utm_source=gb-gplus-shareBrevet US5956097 - System for automatically controlling the tuning of television receiver receiving channels
System for automatically controlling the tuning of television receiver ...