| 摘要 |
<p>PROBLEM TO BE SOLVED: To maintain synchronization establishment by resetting the position in a first synchronous word detection window of a second synchronous word detection window at prescribed conditions. SOLUTION: A CPU 3 decides whether or not a calculated bit error rate matches the reset condition of a second synchronous word detection window generating part 8 stored in a memory 16. The result is written in a second synchronous word detection window generation part reset register of a synchronous register 7 as reset data. The CPU 3 calculates the bit error rate in an N frame, at any time from the number of errors of a synchronous word SW. When conditions which exceed synchronous word bit error rate X% is satisfied, reset of the second synchronous word detection window generation part 8 is performed through an AP2 generation part reset register of the synchronous part register 7. At this time, a generation position of the second synchronous detection window AP2 is changed with a synchronous word detection pulse(d) position in a second synchronous word detection window AP 2 as a reference.</p> |
