| 摘要 |
<p>PURPOSE:To control the running speed of a magnetic tape on the basis of a control signal by providing a capstan motor driving control circuit which drives the capstan motor on the basis of an error signal outputted from a comparing circuit so that the magnetic tape runs at a certain speed. CONSTITUTION:A comparing circuit 22 has the function which compares the extent of time deviation between a reproduced control signal and a reference control signal to generate the error signal an the function which controls a system control circuit 17, and the system control circuit 17 generates a lead/lag control signal by the output of the comparing circuit 22. The lead control signal raises the rotative speed of a capstan motor 4 and the lag control signal reduces that of the capstan motor. The error signal and the lead/lag control signal are inputted to a capstan motor driving control circuit 23, and the capstan motor 4 is so driven that the running speed of a magnetic tape 1 based on these signals is the certain running speed. Thus, the control signal is recorded stably at certain intervals and pictures are reproduced stably at the picture reproducing time.</p> |
