| 摘要 |
PURPOSE:To detect only a receiving burst without detecting a transmitting burst, by using a frame synchronizing signal of a transmitting burst signal for obtaining information of a transmitting burst period and stopping the detection of burst during this period. CONSTITUTION:The presence or absence of an equalization circuit 1 switching a time constant of the automatic gain control for equalization at the receiving burst period and other periods with a receiving burst control signal, is decided at a decision circuit 2 and inputted to a monostable multivibrator 3. Further, a frequency division circuit 4 generates a signal in response to the transmitting burst period from a frame signal of the transmission signal and a transmission clock and supplies the signal to the monostable multivibrator 3 as a reset signal, and since the monostable multivibrator 3 is reset for the period of the transmission signal, the equalizing circuit 1 detects correctly only the receiving burst with the output of the monostable multivibrator 3. |
