Magnetic disk memory

Details Magnetic disk memory Magnetic disk memory

1979-11-28

1981-07-28

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Pulse crowding correction

360 51, G11B 509

Patent

active

042813565

ABSTRACT:
In the apparatus disclosed herein, data recorded on a floppy disk in double density MFM mode is read back using a digital, adaptive time base system which permits accurate recovery of data despite bit shifting due to a high bit density on the magnetic recording surface. The adaptive time base provides successive data windows of non-uniform duration following detection of a data bit and, further, alters the starting reference time based upon the relation of the just received data bit to its predecessor.

REFERENCES:
patent: 3930265 (1975-12-01), Kimura
patent: 4173027 (1979-10-01), Rathbun
patent: 4205352 (1980-05-01), Tomada
"Double Density Design Guide"-Shugart Associates, Application Bulletin.
NEC Microcomputers, Inc., Specification Sheet 4, MPD765, "Floppy Disc Controller".
NEC Microcomputers, Inc., Applications Note #8 for MPD765.

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