| 摘要 |
<p>PURPOSE:To obtain a beat signal with excellent S/N at reproduction by applying 1/4 offset to a frequency of a pilot signal with respect to a horizontal frequency and applying 1/2 offset to a frequency of a beat signal with respect to the horizontal frequency. CONSTITUTION:Frequencies f1-f4 of a pilot signal are selected so as to have 1/4 offset with respect to an integral number of multiple nfh of the horizontal frequency, and a frequency of a beat signal is selected so as to have 1/2 offset. A tracking error is detected based m on a level of a beat signal of frequencies (1/2fh and 3/2fh) between a pilot signal of an object track and a pilot signal from both adjacent tracks at the reproduction side, the capstan servo system or the piezoelectric element of a moving head is controlled by the error to apply tracking control. Thus, the S/N of the heat signal is improved.</p> |
