Note 1: If the number of errors is less than or equal to the maximum correctable threshold of the code, all errors will be corrected.
Note 2: Error-correcting codes require more signal elements than are necessary to convey the basic information.
Note 3: The two main classes of error-correcting codes are block codes and convolutional codes.
See also Hamming code and Reed-Solomon code.
Source: from Federal Standard 1037C and from MIL-STD-188
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