Patent ID: 7725809
Filing Date: 2010-05-25
Classification: G11B,H04L

Abstract:
1. A signal quality evaluation device for evaluating quality of a Viterbi-decodable signal, comprising: Viterbi decoding means for Viterbi decoding the signal to generate a decoded bit sequence and to generate a path metric difference obtained in the Viterbi decoding; specific pattern detection means for detecting a specific pattern in the decoded bit sequence; reverse pattern detection means for detecting a reverse pattern of the specific pattern in the decoded bit sequence; and signal quality evaluation means for detecting respective path metric differences for the specific pattern and the reverse pattern from the path metric difference generated by the Viterbi decoding means and results of detection by the specific pattern detection means and the reverse pattern detection means, to evaluate quality of the signal from the respective path metric differences for the specific pattern and the reverse pattern.