| 摘要 |
<p>PURPOSE:To drive a noise band by permitting the start of a heat to agree with a control signal by delaying the control signal applied to a tracking servo circuit according to a reproduction speed. CONSTITUTION:Tracking offset circuit 19 is a delay circuit composed of a digital counting method that uses signal (a) as a reference clock, and by change-over switch 18 for the variable-speed scale factor control signal (e) is delayed in fixed offset extent and then inputted to capstan servo circuit 10. In accordance with the best tracking offset extent that corresponds to a random variable-speed scale factor, when the scale factor is multiplied or divided by an odd number, the start of the 2ch (channel) head is made to agree with the control signal and when by an even number, the start of the 1ch head is made to agree with the control signal.</p> |
