High Definition Television (HDTV) Compression System High Definition Television (HDTV) Compression System

摘要

The device for encoding / decoding a terrestrial transmission HDTV signal provides a hierarchical codeword CW representing compressed video data in response to a high definition video source signal and an associated codeword T defining the data type represented by the codeword CW. Priority selection circuit 11 parses codewords CW into higher and lower priority codeword sequences in response to codewords CW and T, where higher and lower priority codeword sequences are more important and less important for image reproduction. Corresponds to video data respectively. The transmission processor 12 forms a high and low priority transport block of the high and low priority codewords, respectively, in response to the high and low priority codeword sequences. Each transport block includes a header, codeword CW and error detection check bits. Each transport block is applied to forward error check circuits 15 and 16 to apply additional error check data. Higher and lower priority data is then applied to the modem 17 to spherically amplitude modulate each carrier for transmission.