| 摘要 |
<p>PURPOSE:To stabilize speed deviation between two capstan motors by driving one capstan motor on a basis of the output frequency of a PLL which adds respective output frequencies of a reference oscillator and an auxiliary oscillator. CONSTITUTION:Output frequency f1 of reference oscillator 11 is divided by 1/N frequency divider 12, and the output is given to servo circuit 4 to rotate capstan motor 6. PLL 13 adds output frequency f1 of reference oscillator 11 and output frequency f2 of auxiliary oscillator 14, and output frequency f1+f2 is divided by 1/N frequency divider 15 and is given to servo control circuit 3 to rotate capstan motor 5. Here, even if frequency f1 is fluctuated by some cause, speed deviation of motors 5 and 6 is kept constant almost and a wow and flutter characteristic is hardly degraded because the output of PLL 13 is fluctuated in the same mode.</p> |
