High frequency magnetic recording method

Details High frequency magnetic recording method High frequency magnetic recording method

1985-01-15

1985-10-15

Cardillo, Jr., Raymond F.

Dynamic magnetic information storage or retrieval

Modulating or demodulating

360 30, 360 77, G11B 509, G11B 504, G11B 2110

Patent

active

045478171

ABSTRACT:
A method for recording high frequency signals representing data with simultaneous readout of low frequency information, such as servo information prerecorded on a magnetic disk, comprises the step of modulating with the data a carrier signal having a repetition frequency displaced significantly from the baseband of the data. The nonlinearity of the recording channel converts the modulated signal spectrum into the low frequency baseband so that the data is magnetically recorded while the low frequency prerecorded information is read out.

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patent: 3482033 (1969-12-01), Warren
patent: 3956769 (1976-05-01), Beecroft et al.
patent: 4313140 (1982-01-01), Keidl
patent: 4314289 (1982-02-01), Haynes
patent: 4318141 (1982-03-01), Haynes
patent: 4390911 (1983-06-01), Klaassen

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