| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a PN(pseudo noise) code synchronism pull-in circuit capable of shortening the synchronism pull-in time of a reception PN code in a circuit for measuring a code error. SOLUTION: The matching of a reception PN code 102A and a reference PN code 11 read from a PN code generation circuit 1 in a reverse order is detected in a comparator circuit 2A, the reception PN code 102A is inputted to a DFF 4 and delayed for one clock and the reception PN code 102A delayed for one clock and the reference PN code 11 are compared in the comparator circuit 2B. Then, the matched one of the compared results of the comparator circuits 2A and 2B is selected in a selection circuit 5 and outputted to an error counter 3, an error counted value is counted and simultaneously, the direction of the PN code generation of the PN code generation circuit 1 is switched.</p> |
