System enabling a magnetic code recorded on a magnetic track to

Details System enabling a magnetic code recorded on a magnetic track to System enabling a magnetic code recorded on a magnetic track to

1996-10-18

1998-05-05

Baker, Stephen M.

Excavating

371 403, 371 55, G11B 2018

Patent

active

057486492

ABSTRACT:
The magnetic code may include a run of b spoiled bits in a position that is locatable. The system consists in adding a check structure of k bits to the m-bit message in such a manner that the resulting n-bit word n=m+k is a cyclic redundancy code word generated by a generator polynomial G(x) of degree k that divides x.sup.n -1 without remainder in modulo-2 algebra. On reading, the system locates a packet of spoilt bits by detecting magnetic spoiling of the track which should normally be in the form of magnets of length l.sub.1 =l.+-.l/2 and l.sub.2 =2l.+-.l/2, with there being no runs of an odd number of successive magnets of length l.sub.1, given the bi-phase code used. A detected error is corrected by applying the relationship G(x) to the message as read after circular permutation has been applied thereto to move the missing bits to the end of the message.

REFERENCES:
patent: 5251077 (1993-10-01), Saitoh
patent: 5390195 (1995-02-01), Brush
Patent Abstracts of Japan, vol. 12, No. 380 (P-769) 12 Oct. 1988 corresponding to JP-A-63 126080 (Fujitsu) dated May 30, 1988.
Patent Abstracts of Japan, vol. 12, No. 243 (P-768) 7 Jun. 1989 corresponding to JP-A-01 044627 (Fujitsu) dated Feb. 17, 1989.
Patent Abstracts of Japan, vol. 12, No. 154 (P-700) 12 May 1988 corresponding to JP-A-62 271261 dated Nov. 25,1987.

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