| 摘要 |
<p>PURPOSE:To obtain correct position information without being related to a loss and a dirt by inputting the output of a reference line detecting circuit and an output from a pulse generator, detecting the earliness and lateness of both pulses, putting them into an integration circuit and averaging the reference line position information by the output. CONSTITUTION:A reference detecting circuit 20 detects two reference lines of the 1.5 fold interval of a data bit and outputs them to a timing comparing circuit 21. A pulse generator 23 obtains the prescribed interval from the synchronizing pulse for scanning of an image sensor and generates a pulse. The comparing circuit 21 compares the detecting pulse of a reference line and the pulse fed back from the generator 23 and detects the earliness and lateness. An integration circuit 22 up/down-counts by the early and late pulse and inputs to the generator 23. The return is executed to the comparing circuit 21, comparison is executed, this is repeated over plural numbers of times of scannings, it is controlled so as to be late when it is too early and so as to be early when it is too late, the output of the detecting circuit 20 and the generator 23 becomes the same timing, the position information of the reference line is average and the stable information is obtained.</p> |
