| 摘要 |
<P>PROBLEM TO BE SOLVED: To obtain a present time based on a standard time radio wave more quickly and securely. <P>SOLUTION: A prediction waveform data pattern generation unit 23 generates a plurality of prediction waveform data patterns which have a same time length as that of an input waveform data pattern, each of which represents a code string based on a base time BT and whose head positions are located at the base time BT and time displaced ahead or behind in predetermined seconds. An error detection unit 25 determines consistency/inconsistency of a sample value of an input waveform data pattern with a sample value of a prediction waveform data pattern, and calculates an error number indicating inconsistency for each interval. An effective value acquisition unit 28 computes an effective error number which is an error number concerning an effective interval among error numbers for respective intervals. A consistency judgment unit 26 calculates deviation of the base time BT based on the head position of the prediction waveform data pattern indicating the minimum value of the error number. A CPU 11 determines number of prediction waveform data patterns based on timer accuracy and time difference between a previous processing time and a current processing. <P>COPYRIGHT: (C)2012,JPO&INPIT |
