Automatische Synchronisierungsvorrichtung

摘要

In an automatic synchronizing system comprising a synchronizing circuit including a variable element, a sampling device and a synchronism control circuit which operates to differentiate the output from the sampling device to vary the variable element, to stop the variation of the variable element and to maintain the stopped condition, there is provided a control circuit responsive to the cessation of operation of either one of the synchronizing circuit or the sampling device to start either one of the synchronizing circuit, sampling device and the synchronism control circuit to continue to find a point of synchronism even in the absence of a synchronizing signal for a predetermined interval or even when the amplitude of the synchronizing signal is small. A time axis circuit may be added which may be controlled by the control circuit in the same manner.