Address mark encoding for a record storage medium

Details Address mark encoding for a record storage medium Address mark encoding for a record storage medium

1986-12-19

1988-06-21

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Address coding

360 40, G11B 509

Patent

active

047528419

ABSTRACT:
An information-bearing record medium (magnetic tape, disk, or an equivalent thereof) includes a stream of binary bits in which a binary 1 bit is normally represented by a signal transition at the middle of its corresponding bit cell and a binary 0 bit is normally represented by a signal transition at the trailing edge of its corresponding bit cell so long as the immediately following bit cell contains a binary 0 bit, whereby the spacing between successive normal signal transitions is at least one bit cell and is no greater than two bit cells. The binary bit stream includes an address mark byte, for identifying a future substream of data bits, defined by a unique pattern of signal transition having at least one normal signal transition missing, whereby at least one pair of successive signal transitions is separated by more than two bit cells and less than four bit cells.

REFERENCES:
patent: 3750121 (1973-07-01), Lee
patent: 4319287 (1982-03-01), Swanson

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