| 摘要 |
PURPOSE:To satisfactorily erase a recorded signal in a wide range by recording a prescribed erasure signal from an erasure signal generation part in a necessary area. CONSTITUTION:A signal switching part 200 is controlled through a control part 400, and the erasure signal from the erasure signal generation part 100 is supplied to a signal recording part 300 instead of a recording signal. Recording is executed by the erasure signal whose oscillation frequency changes according to a prescribed voltage value that the generation part 100 outputs signals in areas outside a recording area from a position outside the signal recording area in a prescribed circular track via the recording area, and whose current value gradually decreases as the oscillation frequency rises in a prescribed time. Thus, the signal recorded in the necessary area is satisfactorily erased, and residual recorded erasure signals do not influence the second PCM recording. Consequently, the recorded signals are satisfactorily erased in a wide range.
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