| 摘要 |
<p>PURPOSE:To reduce a noise on a picture by providing a means to adjust the phase of a traveling system to travel a tape, i.e., the revolving phase of a capstan motor so that a detection signal sampled at specified time becomes a peak. CONSTITUTION:At the time of special reproduction, a reproducing signal reproduced from the tape by a reproducing head 5 is amplified by a pre-amplifier 1, and afterwards, it is inputted to a DC detection circuit 2. The detection circuit 2 detects the level of the inputted signal, and outputs it to a microcomputer 3. The microcomputer 3 samples the inputted detection signal at the prescribed time T1, T2, T3, and executes control. Namely, the reproducing signal at the time of the special reproduction is sampled at the beginning time T1, the central part time T2 and the time at the vicinity of the end of a vertical scanning period, and the revolving phase of the capstan motor is controlled so that the level (detection signal of detection circuit 2) of the reproducing signal at the time T2 of the vicinity of the central part becomes the peak. Thus, the noise on the picture can be minimized.</p> |
