Method for error detection

摘要

This invention provides an error detecting method, wherein upon decoding a data signal which is formed by such a manner that a data word D is formed of a predetermined number of bits of digital signals, a data block is formed of a predetermined number of the data words D which are successive on a recording or transmission medium, one error check code CRC is provided for a sequence within the data block and another error check code for another series which is different from said series within said data block is provided for a sequence of said data blocks all of erroneous data words detected by another error check code P are regarded as being erroneous. By this method, the erroneous data word can be positively detected.