Patent ID: 8126064

Claim:
A transmission device operable to transmit a first clock to a reception device, the transmission device comprising: a first reception arrangement operable to receive the first clock; a second reception arrangement operable to receive a second clock; a selection arrangement operable to select any parameter of plural parameters, each of the plural parameters representing a degree of lowering a frequency of the second clock; a frequency lowering arrangement operable to lower the frequency of the second clock received by the second reception arrangement based on the parameter selected by the selection arrangement to produce a third clock; a correlation detecting arrangement operable to detect a correlation between the first clock received by the first reception arrangement and the third clock produced by the frequency lowering arrangement; a transmission arrangement operable to transmit the first clock, the parameter selected by the selection arrangement, and correlation information representing the correlation detected by the correlation detecting arrangement to the reception device; and an information acquisition arrangement operable to acquire allowable range information from the reception device, the allowable range information representing an allowable range of the parameter when the reception device reproduces the second clock as a fourth clock, wherein the reception device receives the first clock, the parameter, and the correlation information from the transmission arrangement to reproduce the second clock as the fourth clock based on the first clock, the parameter, and the correlation information, and the selection arrangement selects any of the plural parameters, each of the plural parameters representing the degree of lowering the frequency of the second clock based on the allowable range information acquired from the reception device.