Viterbi decoder with computer for input data branching - operates by majority logic on content of max. likelihood path obtd. from add-compare-select calculator.

摘要

The decoder computes (3) the amount of branching for input data w.r.t. a number of time slots as a reference for parallel computations. The parallel computations are performed in an add-compare-select standardising circuit (4) w.r.t. an accumulation (6) of branching amts. up to preceding processing stages. The sequence of min. distance is decided (8) by majority decoding of input data corresp. to the content of the computed path (7) in an appropriate interval of time slots. USE/ADVANTAGE - In HDTV reception at more than 30 Megabits per second. Speed limitation set by computation rate of loop within one time slot is overcome.