Erasing apparatus

Details Erasing apparatus Erasing apparatus

1984-02-01

1987-06-02

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of biasing or erasing

G11B 503

Patent

active

046707999

ABSTRACT:
The disclosed erasing apparatus is capable of erasing a signal recorded on a magnetic recording medium from individual recording tracks one by one over an erasing width wider than the width of each recording track. A magnetic head receives an erasing signal from a generating circuit that generates an erasing signal including a sustained oscillation of low frequency outside of the frequency band of a recorded or reproduced signal and a subsequent attenuating oscillation of a frequency higher than the frequency of the sustained oscillation.

REFERENCES:
patent: 2535481 (1950-12-01), Begun
patent: 2704790 (1955-03-01), Gratian
patent: 2898408 (1959-08-01), Folse
patent: 3038036 (1962-06-01), Young et al.
patent: 3156784 (1964-11-01), Kump
patent: 3449529 (1969-06-01), Camras
"Erasure of Magnetic Tape" by John G. McKnight, Journal of Audio Engineering Soc., 7/63, vol. #3.

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