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Chen–Ho encoding is a memory-efficient alternate system of binary encoding for decimal digits.
The traditional system of binary encoding for decimal digits, known as binary-coded decimal , uses four bits to encode each digit, resulting in significant wastage of binary data bandwidth , even when using packed BCD.
The encoding reduces the storage requirements of two decimal digits from 8 to 7 bits, and those of three decimal digits from 12 to 10 bits using only simple Boolean transformations avoiding any complex arithmetic operations like a base conversion.
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