There is disclosed a circuit for controlling the time interval between rotational movements of a plurality of subordinate pictures in a picture-in-picture-type television. The inventive circuit includes a microcomputer, a memory for storing the PIP video digital data, a control decoder and read/write...http://www.google.de/patents/US5206714?utm_source=gb-gplus-sharePatent US5206714 - Circuit for controlling the time interval between rotational movements of a plurality of subordinate pictures in a picture-in-picture-type television or VTR system and method therefor