Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1988-09-09
1990-11-13
Pellinen, A. D.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
361267, 360 66, G11B 5465, H01F 1300
Patent
active
049706217
ABSTRACT:
Noise in the readback signal of a magnetic recording device resulting from spurious pulses in the readback signal produced by transitions of the magnetic remanent state of the yoke in the read/write transducer is eliminated by controlling the occurrence of the spurious pulses. Immediately following the completion of the write process, a decreasing amplitude alternating current is applied to the read/write coil of the transducer to drive the yoke remanent state to a stable or zero remanent state prior to the commencement of the read process.
REFERENCES:
patent: 3887945 (1975-06-01), Nepela et al.
patent: 4471403 (1984-09-01), Dress, Jr. et al.
patent: 4821127 (1989-04-01), Soga et al.
Gailbreath Samuel H.
Simmons Ralph F.
Hewlett--Packard Company
Osborn David
Pellinen A. D.
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