| 摘要 |
<p>PURPOSE:To provide a tracking control device for automatically correcting the occurrence of a tracking error caused by expansion of a magnetic tape due to an environmental temp. change, etc., and to provide how to constitute an expansion coefft. detecting means for the magnetic tape in the longitudinal direction. CONSTITUTION:At the time of reproducing a signal, an expansion coefft. of the magnetic tape 101 at the time of recording the signal is detected by a tape expansion coefft. detecting means 123. Then, automatic tracking control is performed by commanding a synchronizing phase difference between a reference signal generated by a reference signal generating device 112 and a reproducing control signal from a control head 107 so as to correct a tracking error of a magnetic head 104 and a helical track 401 to be generated due to expansion of the magnetic tape 101 by a phase difference reference value generating means 115.</p> |
