Patent ID: 7474651
Filing Date: 2009-01-06
Classification: G04R

Abstract:
1. A radio wave correction clock comprising: a timekeeping unit which includes a timekeeping counter; a reception unit which receives a time calibration signal; a designating unit which designates time correction corresponding to a reception area where the time calibration signal is received; first and second storage units which store time information; an extraction unit which extracts various kinds of time information from the time calibration signal received by said reception unit; a first determination unit which determines whether the time information extracted by said extraction unit is correct or not by each of the various kinds of the time information, and stores time information which is determined as correct in said first storage unit; a second determination unit which performs logic check of each of the various kinds of the time information stored in said first storage unit to determine whether correct information is collected for all of the various kinds of the time information in said first storage unit, and stores correct time information out of the various kinds of the time information stored in said first storage unit in said second storage unit, in a case where said second determination unit determines that correct information is not collected for all of the various kinds of the time information; a modification unit which modifies the time information stored in said first storage unit based on the time information stored in said second storage unit; and a correction unit which corrects said timekeeping counter of said timekeeping unit based on the various kinds of the time information stored in said first storage unit and designation of time correction corresponding to the reception area, in a case where said second determination unit determines that correct information is collected for all of the various kinds of the time information, wherein in response to each extraction of the various kind of time information by said extraction unit, said first determination unit performs its determination concerning all of the various kind of time information and storing the time information determined as correct in said first storage unit, and then said second determination unit performs its determination with latest time information concerning all of the various kind of time information in said first storage unit and storing time information in said second storage unit, and then said modification unit modifies said time information stored in said first storage unit, until said second determination unit determines that correct information is collected for all of the various kind of time information, repeatedly.