| 摘要 |
A method and apparatus are provided for detecting and correcting double errors automatically by generating syndrome S bits from a binary word having check bits and data bits. The syndrome S bits themselves are decoded to locate and correct single errors. Wen double errors occur in the binary word, the syndrome S bits automatically operate a switching device which changes the bits of the binary word one at a time to correct one of the double errors. If one of the double errors is not corrected when a given bit is changed, this is indicated by the syndrome S bits, and the bit under test is restored as the next bit of the binary word is changed or complemented. Whenever one of the double errors is corrected by the switching device, the syndrome bits then indicate the location of the remaining single error, and the syndrome S bits are decoded to correct the second one of the double errors.
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