Method and apparatus for erasing a signal recorded on a magnetic

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

1985-09-16

1987-12-22

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of biasing or erasing

360 741, G11B 503, G11B 1548

Patent

active

047149698

ABSTRACT:
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.

REFERENCES:
patent: 2962560 (1955-05-01), Folse
patent: 2975239 (1954-12-01), Jackson et al.
patent: 3723668 (1973-03-01), Ritchey
Published Japanese Patent Application 58-15822 (Japanese original, English abstract, and complete translation included).
"Erasure of Magnetic Tape", J. G. McKnight, Journal of the Audio Engineering Society, Jul. 1963, vol. 11, No. 3, pp. 223-233.

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