Magnetic record erase circuit

Details Magnetic record erase circuit Magnetic record erase circuit

1987-05-20

1989-09-05

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of biasing or erasing

G11B 503

Patent

active

048644358

ABSTRACT:
A magnetic record erase circuit which is capable of substantially erasing frequency signals such as video signals recorded in a rotary magnetic recording medium such as a magnetic disc or a magnetic drum. In the magnetic record erase circuit, when a plurality of frequency-multiplexed signals recorded in one or all of tracks provided on the rotary magnetic recording medium are to be erased, the frequency of an erase signal to be supplied to a magnetic head forming a part of recording means can be varied increasingly stepwise in a given range and at least in the lower frequency region of the given range the current value of the erase signal can be set higher than the optimum recording current value of the magnetic head.

REFERENCES:
patent: 4717975 (1988-01-01), Ogura et al.

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