| 摘要 |
PURPOSE:To suppress a mistake in counting so as to count accurately, the number of traversed tracks by inputting the output signal holding the preceding frequency when a tracking signal is omitted or mixed with an unnecessary signal component. CONSTITUTION:During the holding operations of a sample holding circuit 23, a voltage controlling oscillator 24 outputs a signal holding the frequency at the holding operation starting time to a counter 3 by means of a voltage held by the sample holding circuit 23 and a signal processing circuit 2 performs frequency holding operations. It the fluctuation of the moving speed of a recording and reproducing head while a disturbance occurs is negligible, mistakes in counting can be suppressed by holding frequencies inputted to the counter 3 constantly while disturbance occurs.
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