Patent ID: 8000173
Filing Date: 2011-08-16
Classification: G04R

Abstract:
1. A time correcting apparatus comprising: a signal reception unit that receives a standard time radio wave; an input TCO data generating unit that performs sampling of a signal including a time code output from the signal reception unit so as to temporarily store a bit string of a predetermined number of frames in a memory as input TCO data; an internal time measurement unit that obtains a current time by an inner clock; a prognostic TCO data generating unit that generates a bit string of prognostic TCO data corresponding to the current time based on the current time obtained by the internal time measurement unit; an error number calculating unit that compares bits of the input TCO data with bits of the prognostic TCO data so as to calculate a number of errors corresponding to a number of discrepancies between the bits of the two pieces of TCO data, and repeats comparison of the bits by using new TCO data generated by shifting the bits of the prognostic TCO data or the input TCO data, thereby calculating a plurality of numbers of errors relating to the comparisons, respectively; a validity judging unit that judges whether or not one of the numbers of errors calculated by the error number calculating unit is valid; an error calculating unit that calculates an error of the current time obtained by the internal time measurement unit based on a number of shifted bits relating to the calculation of the number of errors judged to be valid; and a correction unit that corrects the current time of the inner time measurement unit based on the error calculated by the error calculation unit.