Patent ID: 7583949

Claim:
A radio wave receiving device comprising: a timekeeping section which measures a current time; a receiving section which receives a radio signal including time information; a local oscillation section which outputs a local oscillation signal having a predetermined frequency; a frequency conversion section, connected to the receiving section and the local oscillation section, which converts a frequency of the radio signal from the receiving section to an intermediate frequency signal having a frequency that is determined based on the frequencies of the radio signal and the local oscillation signal, and which outputs the intermediate frequency signal when the local oscillation signal is supplied from the local oscillation section, and directly outputs the radio signal from the receiving section as the intermediate frequency signal when the local oscillation signal is not supplied from the local oscillation section; a time information detection section which performs an operation to detect the time information from the intermediate frequency signal that is output from the frequency conversion section; a judgment section which judges whether the time information detected by the time information detection section is correct or incorrect; a stop control section which stops operation of the local oscillation section when the judgment section judges that the time information is incorrect; a time correction section which corrects the current time measured by the timekeeping section based on the time information detected by the time information detection section when the judgment section judges that the time information is correct; and a transmission section which modulates a carrier having a same frequency as that of the intermediate frequency signal according to the current time corrected by the time correction section, and which transmits the carrier.