| 摘要 |
PURPOSE:To correct the drop-out of pulses and to prevent errors, by providing a correcting circuit, which is so constituted that the output signal of a synchronizing signal circuit is fed back, for the drop-out of pulses included in a synchronizing signal separated from a PCM reproduced signal. CONSTITUTION:The output signal from a signal generating circuit 7 is inputted to a synchronizing signal generator 11 through a frequency divider 8, and a horizontal synchronizing signal is outputted from a monostable multivibrator 15. The horizontal synchronizing signal obtained from the synchronizing signal generator 11 is fed back by a correcting circuit 14, and the output signal is inputted to an AND gate 21 through an OR gate 20 of the correcting circuit 14, and the drop-out of the input signal inputted from a synchronizing signal separating circuit 9. If a phase shift is generated between the input signal from the synchronizing signal separating circuit 9 and the synchronizing signal of the synchronizing signal generator 11, the phase shift is detected by a detecting circuit 13, and the feedback due to the correcting circuit 14 is stopped temporarily, and thus, the influence due to the phase shift in the correcting circuit 14 is eliminated. |
