Patent ID: 7840881

Claim:
A communication system comprising: a transmitting device; and a receiving device, wherein the transmitting device includes, addition bit string connecting means for connecting an addition bit string containing at least one bit 1 to information data, CRC computing means for generating a CRC code corresponding to a remainder at a polynomial ring on a Galois field defined modulo 2 based on a predetermined generator polynomial of the information data connected with the addition bit string, and transmitting means for transmitting the information data connected with the CRC code, and the receiving device includes receiving means for receiving the data transmitted from the transmitting means, addition bit string adding means for performing an addition of the data received and the addition bit string at a polynomial ring on a Galois field defined modulo 2, and CRC checking means for making a decision as to presence or absence of a transmission error by determining the remainder at the polynomial ring on the Galois field defined modulo 2 based on the generator polynomial of data obtained by the addition bit string adding means.