JPS56149877A - Delaying circuit of recording and reproducing equipment - Google Patents

Abstract

PURPOSE:To stabilize the operation in case of the reproduction mode and make the demodulation of a signal, etc. satisfactory at the time of special reproduction, by making a delay time of the 1H delaying circuit which is used for drop-out compensation, demodulation of a linear sequential signal, etc., equal to the horizontal scanning period of a reproducing picture signal at all times. CONSTITUTION:A picture signal from the FM reproducing signal input terminal 1 is demodulated by the demodulating circuit 3, and the reproducing picture is usually output to the output terminal 2 through the switching circuit 6. Also, when drop-out is detected by the drop-out detecting circuit 5, the circuit 6 is switched by the variable delaying circuit 7, and the reproducing picture signal which has been delayed by 1H is output from the output terminal 2. In this case, a refresh signal is sampled from the reproducing picture signal by the gate circuit 11, is provided to the FM detecting circuit 9, a frequency variation of the refresh signal is detected, and its frequency variation is integrated by the integrating circuit 8. And, a delay time of the circuit 7 is controlled by the output from the circuit 8, the delay time is always made equal to the horizontal scanning period of the reproducing picture signal, and the operation in case of a special mode is stabilized.