Reduced memory size set top box which stores frames and associated motion vectors which indicate which block or blocks are to be retrieved from memory

摘要

A real time decoder converts received compressed digital video signals to television luma and chroma format for current display. Incoming signals are error checked and corrected and directly stored in compressed format in a memory under control of a digital signal processor. For each video frame to be currently displayed, a current data block is identified and stored in a current block buffer. Data blocks from a previous frame are identified from motion vector data of the current block and accessed from memory to be temporarily stored in one or more buffers. Inverse discrete cosine transformation decodes the data blocks, the resulting data being added to difference data in the current data block, the resulting data fed to a post processor for output as television format signals.