| 摘要 |
PURPOSE:To prevent the titled circuit from disabling reception due to pseudo pull-in and to improve the reliability of a receiving device by starting/stopping a sweeper on the basis of a failure detecting signal detected by an error ratio of a demodulating signal. CONSTITUTION:The phase of an input signal is detected by a phase detecting means 101, identified by a identifier 103 and coded by a code conversion means 104 on the basis of differential logic. A code error ratio is detected by an error detecting means 105 and divided with frequency by a failure detecting means 106, and when the frequency-divided value exceeds a specified value, a failure detecting signal is generated and the oscillation frequency is sweeped to a range wider than a pull-in range by the sweeper 102. |
