ONE-BIT ERROR CORRECTING CIRCUIT BASED UPON CRC OPERATION

PURPOSE:To provide an one-bit error correcting circuit based on CRC operation which can be contracted at its size and reduced at its cost by providing the circuit with an one-bit error detecting means, a main signal reproducing means and a correcting means. CONSTITUTION:The one-bit error detecting means 41 decodes residual data obtained by circulating syndrome S to a 1st residual computing means 47 and detects one-bit error data. The main signal reproducing means 42 finds out exclusive OR 51 between residual data obtained from the output data of a prescribed register 19 in a cancel type syndrome forming part 11 through a 1st residual computing means 50 and data supplied from a prescribed register 18 and obtains main signal parallel data. The correcting means 43 finds out exclusive OR 54 between the parallel data obtained by the means 42 and the one-bit error data detected by the means 41 and finds out correction data H1' to H5'. The number of constitutional parts of each of these means 41 to 43 is remarkably reduced as compared with that of an error correction part in the one-bit error correcting circuit corresponding to the means 41 to 43.