Patent ID: 8073651
Filing Date: 2011-12-06
Classification: G04R

Abstract:
1. A time acquisition apparatus comprising: a receiving member to receive a standard time radio wave; a received, waveform data obtaining member to perform sampling to a signal including a time code output from the receiving member with a predetermined sampling period to obtain one frame of received waveform data where each sample has a value represented by a plurality of bits; a received waveform data memory to store the received waveform data; a prediction code data generating member to generate one frame of first prediction code data corresponding to a code of a position marker or a marker, in which data each sample has 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 calculating member to compare the one frame of the received waveform data stored in the received waveform data memory with the first prediction code data, the second prediction code data and the third prediction code data respectively, to calculates a first correlation value, a second correlation value and a third correlation value which indicate correlations between the received waveform data and the first, second, and third prediction code data; a code determining member to compare the first, second, and third correlation value with one another to specify the prediction code data corresponding to the largest correlation value, and to sequentially store codes corresponding to the specified prediction code data in a code memory; and a current time calculating member to calculate current time based on the time code indicated by the code, with reference to the code sequence stored in the code memory.