| 摘要 |
PURPOSE:To suppress deterioration in inspection ability due to an increase in error rate by considering that all symbols can not be corrected when the number of flags added during the 1st decoding exceeds a specific number. CONSTITUTION:When an error is corrected, a received signal is inputted firstly and a syndrome generating circuit 1 generates a syndrome. In the 1st decoding, the error detection of a reed-solomon code and the error is detected. In the 2nd decoding, the number of flags added in the 1st decoding is counted by a counter 2, and the result is compared by a comparing circuit 5 with the specific number inputted from a P-ROM 11. When the number of flags is smaller than the specific number, decoding is performed by a program, the error position and error pattern are found, and wrong data is corrected. When the number of flags is larger, on the other hand, an incorrectable flag is outputted from a data input output terminal 20 for all symbols. Consequently, the detection ability when the error rate is low is improved.
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