| 摘要 |
<p>PURPOSE:To rapidly perform a detection by providing a detection means which detects the presence or the absence of the output of magnetic heads which reproduce a recorded information from the current direction and the reverse direction tracks, respectively. CONSTITUTION:Signals are inputted to an envelop detecting circuit 18, the envelops are detected, the detection output is transmitted to a microcomputer 14 and the presence and the absence of the signals are discriminated by the microcomputer 14. The signals inputted to the circuit 18 are the reproduction signals of the signals recorded on the tracks in the current direction and the reverse direction and these signals in conjunction with the circuit 18 are detected by the microcomputer 14.</p> |
