| 摘要 |
PURPOSE:To secure the automatic release to the short break which causes the step- out via the central value initial setting system by securing the countermeasure of the automatic control system to the short break with the reduced break detection time. CONSTITUTION:When the break signal is supplied to low pass filter of the reception side, break detector circuit 5 operates to give a slow control to automatic equalizer in the central value direction via logical sum circuit 8. Based on the tap information of equalizer 2, the automatic control systems of timing automatic phase control circuit 6 and carrier automatic phase control circuit 7 are given the initial setting in the central value direction by means of the 0.1-pulse pattern of about 50% duty. In case the step-out is caused, it is detected through step-out detector circuit 9 and then applied to automatic initial setting circuit 11 via initial setting protective time setting circuit 10. When the step-out time exceeds the setting time of circuit 10, circuit 11 is actuated to supply the initial setting information to circuit 8. |
