Patent ID: 8553756

Claim:
A data transmission system comprising: a device that delays a signal having a predetermined base frequency so as to generate a reference-phase signal having a reference phase, a delay signal which is more delayed than the reference signal by a predetermined unit of time, and an advance signal which is more advanced than the reference signal by the unit of time; a device that selects one of the reference-phase signal, the delay signal, and the advance signal so as to output a data signal in which a phase of one of the rising edge and the falling edge of the data signal varies in accordance with values of transmitted data, and a phase of the other of the rising and falling edges is constant; a device that generates a reference signal at the timing of one of the rising edge and the falling edge of the data signal, said one having the constant phase; and a device that reproduces the data by measuring a phase difference between the generated reference signal and the data signal at the timing of the other of the rising and falling edges which has the varying phase.