Compact, real time tape drive system

Details Compact, real time tape drive system Compact, real time tape drive system

1988-04-25

1990-01-09

Smith, Jerry

Excavating

G11B 2018

Patent

active

048933120

ABSTRACT:
A nine track digital tape system operating in accordance with a feedback shift register redundancy scheme, includes in both the encoding and writing section and in the reading and error correction section, arrangements for shifting successive bytes of information by one digit place, and adding the shifted bytes, to provide a "low product" and a "high product", constituting an address or "pointer" to a modifier table, from which a modifier value is obtained to be added to the "low product". In the error correction circuitry, additional tables, using a sample parity error vector and an identification of the columns in which errors occur, as "pointers", provide data which is used to calculate error correction vectors. Instead of using feedback registers, and complex decoding hardware, the circuitry obtains the same result as would have been obtained by the hardware, in a unique manner, to provide a simple, high speed, error correction system.

REFERENCES:
patent: 3798597 (1974-03-01), Frambs et al.
patent: 4052698 (1977-10-01), Ragle
IBM Article, "Magnetic Tape Coding", by A. M. Patel and S. J. Hong, dated Nov. 1974, pp. 580 through 588.

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