Magnetic recording system with pulse qualification and error cor

Details Magnetic recording system with pulse qualification and error cor Magnetic recording system with pulse qualification and error cor

1993-10-22

1995-01-24

Nguyen, Hoa T.

Excavating

371 55, G11B 509, H03M 1300

Patent

active

053847903

ABSTRACT:
Special tape drive read circuitry generally qualifies read voltage peaks by establishing a minimum amplitude for valid peaks in the read voltage signal so that noise is not interpreted as peaks, but does not require amplitude qualification during periods of dropout in the read voltage signal. Additional circuitry recognizes two of the data errors most common to GCR, and allows for these errors to be corrected. The first kind of error is the tri-bit error, in which 01110 is misinterpreted as 01000. The other kind of error is the low frequency error, in which 10010 is misinterpreted as 11000. Also, the type of error detected is used to adjust the read drive's hysteresis setting, to reduce future errors of the same type.

REFERENCES:
patent: 3639900 (1972-02-01), Hintz, Jr.
patent: 4823208 (1989-04-01), Ouchi et al.
Bergmann et al, "Half weight block codes for optical communications", AT&T Technical Journal, vol. 65, issue 3, May/Jun. 1986, pp. 85-93.

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