Apparatus for decoding an HDTV signal conveyed as high and low priority data in high and low priority channels respectively, wherein said high and low priority data originated from blocks of hierarchically encoded compressed video data, with data of greater importance for image reproduction from each...http://www.google.com.tw/patents/US5148272?utm_source=gb-gplus-share專利 US5148272 - Apparatus for recombining prioritized video data
