Method of operating a digital video tape recorder apparatus that receives encoded and packetized digital video data, depacketizes the received data and decodes the data to the extent necessary to select a subset of the data for use during trick play operation. In one embodiment, the digital video...http://www.google.com.hk/patents/US5729648?utm_source=gb-gplus-share專利 US5729648 - Method and apparatus for selecting encoded video data for use during video recorder trick play operation 
