| 摘要 |
<p>PURPOSE:To obtain the steady picture by giving the control to the rotation of the head motor so that the horizontal synchronous cycle may be identical between the double-speed reproduction time and the normal reproduction time for the VTR. CONSTITUTION:The alternating record scanning is carried out via rotary magnetic heads HA and HB featuring the different azimuths. And the high-speed reproduction is given to the magnetic tape which formed the recording track with the shift given to the opposite side of the scanning by 0.75H and with the high-speed running in the velocity of an odd-fold of the normal reproduction speed. At this double-speed reproduction time,the switch is changed over to the double-speed reproduction side T. Thus division output (a) which gave the frame division to the reproduction horizontal signal relating the rotations of heads HA and HB is supplied in the form of the comparison signal of comparator circuit 15. And reference signal (c) formed based on reference signal (b) of the frame division is sample-held, and the rotation of head motor 17 is maintained based on the holding output to secure the fixed reproduction horizontal cycle.</p> |
