Patent ID: 7519031

Claim:
A differential communication system having a transmitting device and a receiving device that are connected to be able to communicate with each other and perform differential communication therebetween, comprising: a match determining device that determines whether or not reference information used by the transmitting device and reference information used by the receiving device are the same during differential communication; and a reference-information changing device that changes, based on a result determined by the match determining device, reference information in at least one of the transmitting device and the receiving device so that the reference information used by the transmitting device and reference information used by the receiving device become the same, the transmitting device including a difference-information generating device that generates, based on the reference information used by the transmitting device, difference information from information to be transmitted, and a transmitting component that transmits the difference information generated by the difference-information generating device to the receiving device, and the receiving device including receiving component that receives the difference information from the transmitting device, and an information restoring device that restores, from the difference information received by the receiving component, information to be transmitted, based on the reference information used by the receiving device.