公开(公告)号：US4562578A

公开(公告)日：1985-12-31

申请号：US494325

申请日：1983-05-13

申请人： Kentaro Odaka ,  Yoichiro Sako ,  Yuichi Kojima ,  Kenji Nakano ,  Hisayoshi Moriwaki

发明人： Kentaro Odaka ,  Yoichiro Sako ,  Yuichi Kojima ,  Kenji Nakano ,  Hisayoshi Moriwaki

IPC分类号： G11B3/00 ,  G11B7/00 ,  G11B20/12 ,  G11B20/18 ,  H03M13/27 ,  H04B14/04 ,  G06F11/10

CPC分类号： G11B20/1809

摘要： In the recording/reproducing of digital audio signals, errors are detected and corrected by using two parity words, one arranged at the center of the block formed of data words and the arranged at one end of the block. The probability that uncorrectable error will be present in the center of the block is relatively high, so placing the parity word there prevents loss of the more valuable data. Maximum correctable burst errors are determined by the length of the block, so placing the other parity word on the end of the block lengthens it and improves burst error correction. The parity words are arranged as indicated before adding a cyclic redundancy check (CRC) code to the data signal and then modulation coding the signal before recording. During playback, the reproduced signal is demodulated and the CRC code used to detect errors for which error pointers are generated. The reproduced data is read into memories in accordance with generated addresses and the pointers prevent the writing in of words found to be in error, which error words are subsequently corrected if possible using parity codes originally encoded into the signals prior to recording.

摘要翻译： 在数字音频信号的记录/再现中，通过使用两个奇偶校验字来检测和校正错误，一个排列在由数据字形成的块的中心并排列在块的一端。 在块的中心存在不可校正错误的概率相对较高，因此将奇偶校验字放置在此可防止丢失更有价值的数据。 最大可纠正的突发错误由块的长度确定，因此将另一个奇偶校验字放在块的末端会延长它并改善突发错误校正。 在将循环冗余校验（CRC）码添加到数据信号之前，奇偶校验字按照指示排列，然后在记录之前对信号进行调制编码。 在播放期间，再现信号被解调，并且用于检测产生错误指针的错误的CRC码。 根据生成的地址将再现的数据读入存储器，并且指针防止写入发现的错误的字，如果可能的话，随后可以使用最初编码到记录之前的信号中的奇偶校验码校正哪些错误字。