| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a radio controlled clock which verifies time information reconstructed from standard radio wave in a short period of time. <P>SOLUTION: Regarding the phase ϕ<SB>N, m</SB>of a carrier wave (carrier) of a long-wave standard radio wave calculated by a phase arithmetic circuit 23, based on the same phase component and orthogonal component generated by an orthogonal detection circuit 18, a dispersion arithmetic circuit 24 finds the dispersion from the reference phase varying at a time variation proportional to the error ε of a reference signal CK2. When the dispersion is an allowance or less, a time verifying circuit 26 determines that the receiving state (S/N) of the carrier is good, and determines the possibility of correction of the clock time according to the verifying result of the time information obtained from a single frame. When the dispersion is more than the allowance, the time verifying circuit 26 determines that the receiving state of the carrier is bad, and prohibits the correction of the clock time regardless of the verifying result of the time information. <P>COPYRIGHT: (C)2007,JPO&INPIT |
