Circuitry operative on symbol decoding results for synchronizing data fields in a digital television receiver

摘要

A digital television signal receiver includes a data slicer for symbol decoding and match filtering to recover data synchronizing information from the symbol decoding results. The match filtering comprises a shift register for receiving as serial input thereto the parallel-bit-groups of symbol decoding results from the data slicer and respective decoders for the serial input signal to the first of a number of successive stages of the shift register and for the output signal of each stage in that number of successive stages. The decoder results are combined using an AND gate when match filtering is performed to detect data segment synchronization symbol code sequences. In other match filtering the decoder results are combined using a digital adder network, and a threshold detector responds to the summed decoder results exceeding a threshold value to detect data field synchronization symbol code sequences.