Method and apparatus for erasing a signal recorded on a magnetic disk

摘要

A video signal recorded on a magnetic disk is erased by applying a fixed frequency erasing signal 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, are effective in removing the resident video signal and in preparing the disk for a new recording.