Write precompensation system

Details Write precompensation system Write precompensation system

1977-12-20

1979-10-30

Thomas, James D.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Pulse crowding correction

364900, G11B 509

Patent

active

041730275

ABSTRACT:
A logic system is provided for precompensating data and clock bits of a formatted binary information stream during a modified frequency modulation (MFM) encoding for recording on a magnetic medium. The binary information stream is formatted into a gap field, an address preamble field, an address mark field and a data field. Clock bit generation is inhibited during the gap and address preamble fields. Further, a second of three clock bits occurring during the high order half-byte of the address mark field is suppressed to provide a modified MFM (M.sup.2 FM) field. An address mark is provided thereby for indicating the near proximity of a data field. Beginning with the low order half-byte of the address mark field, both MFM clock precompensation and MFM data precompensation is applied as required. The amount of peak shift occurring in the MFM encoded information stream after precompensation is substantially reduced.

REFERENCES:
patent: 3067422 (1962-12-01), Hunt
patent: 3879342 (1975-04-01), Patel
patent: 3911485 (1975-10-01), McGrath
patent: 4009490 (1977-02-01), Fassbender

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