| 摘要 |
<P>PROBLEM TO BE SOLVED: To acquire current time by appropriately acquiring codes included in standard time radio waves without being affected by the state of electric field strength or signal noise. <P>SOLUTION: A received waveform data memory 22 stores one frame of received waveform data acquired by sampling a signal including a time code with a predetermined sampling period, where each sample is a value represented by a plurality of bits. Correlation value computation parts 24-26 compare the received waveform data with one frame of first prediction code data corresponding to a position marker or a code of a marker, where each sample is a value represented by a plurality of bits; one frame of second prediction code data corresponding to a code 0; and one frame of third prediction code data corresponding to a code 1. A correlation value comparing part 27 compares first, second, and third correlation values with one another to specify the prediction code data of which correlation is the strongest to output the code data. <P>COPYRIGHT: (C)2010,JPO&INPIT |
