| 摘要 |
In the case of delaying any one of the detected signals, which are optically obtained from a plurality of trucks, in which the information are respectively recorded under a state that the DC component is removed, a zero cross waveform is extracted from a main detected signal, which is obtained from a main truck. Then, a sub detected signal obtained from a sub truck is held at a timing at which this zero cross waveform is extracted. Further, a sub detected signal, which has been held during a predetermined time frame, is averaged. Moreover, delay amounts with respect to the sub detected signal and the main detected signal are calculated by comparing a waveform of the averaged sub detected signal and the zero cross waveform. Then, the present sub detected signal and the main detected signal are delayed by the calculated delay amounts.
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