Write precompensation and write encoding for FM and MFM recordin

Details Write precompensation and write encoding for FM and MFM recordin Write precompensation and write encoding for FM and MFM recordin

1979-05-14

1981-01-13

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Pulse crowding correction

360 43, G11B 509

Patent

active

042452635

ABSTRACT:
Information to be written in the form of magnetic flux reversals on the surface of a disk or diskette is applied in serial fashion to a first shift registor. The parallel outputs of the shift register address a PROM. The PROM output is applied to a second shift register in the form of clock and data bits to be written on the disk or diskette magnetic surface. Control signals applied to the PROM address terminals select the mode, FM or MFM, the address mark or if precompensation is required.

REFERENCES:
patent: 3879342 (1975-04-01), Pzrel
patent: 4000512 (1976-12-01), Lau
patent: 4000513 (1976-12-01), Precourt

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