Abstract
It is generally accepted that the resolution goal for a new high-definition television (HDTV) system is to transmit over the air more than 1000 lines with progressive scanning at 60 frames/sec within one single 6-MHz channel. The currently available transmission and video compression technologies do not appear to support such a high video resolution. As a result, the transmission formats currently being considered for the digital HDTV standard are at a lower spatial resolution and/or at a lower frame rate than the resolution goal. This article addresses the question of how future developments in the video compression technology can be incorporated to migrate towards the resolution goal in a receiver-compatible manner. The approach that we propose is to use enhancement data that can be combined with the standard video data. As new video compression technologies are developed, the number of bits needed to support the standard transmission formats will decrease and the channel capacity released can be used to encode the enhancement data. The standard HDTV receivers will utilize the standard video data, ignoring the enhancement data. More advanced HDTV receivers will combine the enhancement data with the standard video data to migrate to the desired resolution goal.
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