Method and system for detecting a predetermined number of unidirectional errors
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United States of America Patent
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Sep 1, 1987
Grant Date -
N/A
app pub date -
Jun 18, 1985
filing date -
Jun 18, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and system for employing systematic check codes for detecting a predetermined number of unidirectional errors in the transmission of data. In accordance with the invention check codes are produced from information codes such that for all possible pairs of (n+m)-bit data words formed by a predetermined set of n-bit information codes and corresponding m-bit check codes, either the pair of words is unordered or the Hamming distance between the data words of the pair is greater than or equal to t+1, where t is the maximum number of unidirectional errors that can be detected. First check codes are generated at a data source, second check codes are generated from the received information code at a data sink, and the received first check codes are compared with the second check codes to determine the existence of a disparity. Sequential and combinational logic circuits are provided for producing check codes having two or more bits.
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