| 摘要 |
PROBLEM TO BE SOLVED: To stably recover a frame synchronization symbol even when a response speed of an automatic gain controller is increased in the case of receiving a signal whose frame synchronization symbol denotes a non-signal period. SOLUTION: In interlocking with a change in an output signal of a frame synchronization symbol detector 21 at the arrival of a frame synchronization symbol, a band width of a variable band low-pass filter 14 is varied by a filter control means 24 to set a response speed of an automatic gain controller 11 lower. Thus, it is prevented that the operation is conducted with a maximum gain for automatic gain control for the frame synchronization symbol period and the frame synchronization symbol of the received signal is stably recovered. |
