Patent ID: 9292006
Filing Date: 2016-03-22
CPC Classification: G04F,G04R

Claim Text:
1. A radio-controlled timepiece comprising: a timepiece measuring circuit configured to serve as a reference signal source during a time measurement; a heterodyne receiver circuit configured to receive radio waves from an external source; a PLL circuit configured to generate a local oscillation frequency used by the heterodyne receiver circuit, wherein the timepiece measuring circuit serves as a reference frequency generating unit that generates a reference frequency of the PLL circuit; a control unit that changes an oscillation condition of the timepiece measuring circuit, based on a reception and a non-reception of the radio waves from the external source, the control unit changing the oscillation condition of the timepiece measuring circuit such that the oscillation frequency of the timepiece measuring circuit differs based on the reception and the non-reception of the radio waves from the external source; and a correcting unit that corrects a time measurement drift of a time measurement during the reception of the radio waves from the external source that is relative to a time measurement during the non-reception of the radio waves from the external source, the time measurement drift being consequent to the oscillation frequency of the timepiece measuring circuit differing based on the reception and the non-reception of the radio waves from the external source.