1983-12-08
1986-01-14
Atkinson, Charles E.
Excavating
371 38, G06F 1110
Patent
active
045649413
ABSTRACT:
The present invention provides methods and apparatus for improved error detection in a data processing system. The techniques of the present invention insure that there is a high probability that an error in a record of data (each record comprising a plurality of data bits) is detected. In the event of an error, the present invention applies a randomizing function to the error which modifies subsequent bits within the record and then propagates and further randomizes the error throughout the record to magnify its apparent size. The randomizing and propagation of the error significantly lowers the misdetection probability for random errors within a record, in that error detectability is no longer pattern sensitive. The use of both propagation and randomization functions significantly alters the data containing an error, such that a high probability of detection using check-sum techniques exists.
REFERENCES:
patent: 3404373 (1968-10-01), Srinivasan
patent: 3430037 (1969-02-01), Renelt
patent: 3576952 (1971-05-01), Van Duuren
patent: 4142243 (1979-02-01), Bishop et al.
Glover Neal
Williams Richard
Woolley Richard N.
Apple Computer Inc.
Atkinson Charles E.
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