CONTROL CIRCUIT FOR SLOW MOTION REPRODUCTION

摘要

PURPOSE:To attain noiseless pattern on a slow motion reproduced picture plane by detecting the deviation of stop position of a magnetic tape by the generating phase of noise, and controlling the stop timing of the magnetic tape depending on the generated phase. CONSTITUTION:The magnetic tape 1 divides a head switching signal by a frequency divider 16, and driven intermittently by the output signal of an FF18 risen in synchronizing with the leading edge of a frequency division output and descended in synchronizing with a trailing edge of a delay output delayed by a reproduced control signal with a monostable multivibrator 17. In such a case, the trailing edge of the drive pulse is controlled by switching the delay amount of the monostable multivibrator 17 according to the relation of phase of a noise (dropout) signal at the delay time control circuit 30. Thus, the sequential stop position of the tape 1 is controlled to a position not generating noise on the reproduced automatically picture plane thereby attaining automatically noiseless slow motion.