| 摘要 |
PURPOSE:To prevent an increase of overlooking of an error detection by a CRC code, and to correct an error by decreasing the number of times of correction by a parity code by following an increase of generation of a data error, and executing the error detection by the parity code by a portion of the number of times of decrease. CONSTITUTION:A reproducing voice digital signal to which parities P, Q of two sequences are added is brought to frame constitution, and a CRC code is added to each frame and written in a data memory 1. An error pointer signal is outputted by an error detection by this CRC code, and an error pointer is set in an error pointer memory 2. On the other hand, the contents of a memory 1 are brought to parity check by the parity P in a parity checking circuit 4, and following an increase of generation of an error, a switch sets the error pointer in the memory 2 through an error pointer generating circuit 9, the number of times correction of an error by a P parity correcting circuit 8 decreases, and the number of times of detection of an error increases. With regard to the parity Q, too, the processing is executed in the same way, and an increase of overlooking of an error detection by the CRC code is prevented, and an error is corrected. |
