| 摘要 |
<p>PURPOSE:To obtain the picture less in the crosstalk and excellent in S/N, by detecting the rotating phase error of the rotating head produced at recording and controlling the magnetic tape according to the phase error voltage obtained from this signal and the reference signal. CONSTITUTION:The phase error voltage is fed also to the phase modulator 13. On the other hand, the rotation detection signal of frequency proportional to the rotating speed of the capstan 14 via the frequency generator 16 is fed to the phase modulator 13 via the frequency divider 17. The phase modulator 13 outputs pulse with the phase error voltage from the phase comparator 4 and the rotation detection signal from the frequency divider 17 and it is fed to the phase comparator 19 as the comparison signal. The phase comparator 19 compares the reference signal from the reference signal generating circuit 20 with the comparison signal to output the phase error voltage according to the phase difference so that the revolution speed of the capstan motor 22 is made constant and the rotation phase is also controlled according to the phase error voltage. With this constitution, the picture less in the crosstalk and excellent in S/N can be obtained.</p> |
