| 摘要 |
<p>A video signal recorded on a magnetic disk (10) is erased by applying a fixed frequency erasing signal from an oscillator (48) as the disk is decelerating. By recording the erasing signal while slowing the disk, an effect is obtained that is comparable to scanning through a range of increasing frequencies. The high frequencies obtained, which are ordinarily beyond the frequency response of the erasing circuit (30, 48), are effective in removing the resident video signal and in preparing the disk for a new recording.</p> |
