Note: BCH codes are not limited to binary codes, but may be used with multilevel phaseshift keying whenever the number of levels is a prime number or a power of a prime number, such as 2, 3, 4, 5, 7, 8, 11, and 13. A BCH code in 11 levels has been used to represent the 10 decimal digits plus a sign digit.
Source: from Federal Standard 1037C
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