| 摘要 |
PURPOSE:To prevent an error from being overlooked by controlling an area to be corrected not by correction but by replacement depending on the occurrence state of the error. CONSTITUTION:A reproduced digital signal inputted from an input terminal 1 is subjected to 1st stage decoding by a decoder 2 in the row direction at first. Then the 2nd stage of decoding is applied by using decoders 3-5 taking error correction word number in the column direction as 4, 3, 2 based on the result of decoding and the decoding data is stored respectively in memories 6-8. A counter 9 calculates number of columns not corrected by the decoder 4 in the column direction at each, e.g., unit of product sign. Then a selector 10 selects any of the memories 6-8 by using a count C and a decoded data is outputted from an output terminal 11.
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