| 摘要 |
PROBLEM TO BE SOLVED: To provide a circuit for reducing noise due to inter-code interference that performs noise reduction processing at high speed. SOLUTION: A forward filter 10 predicts inter-code interference and an adder 20 calculates a forward filter output signal and feedback filter output signals (compensation signals) to whiten noises in a reproduction signal subjected to partial response equalization. Then a Viterbi detector 30 receives the output of the adder 20 to decode it. A feedback filter 40 produces the compensation signals by using path outputs selected depending on comparison results of path metrics. The feedback filter 40 comprises register replacement type shift registers. COPYRIGHT: (C)2004,JPO |
