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Reference.org
Chen–Ho encoding
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<p> Chen–Ho encoding is a memory-efficient alternate system of <a href="/facts/Binary_numeral_system/a6JDSRPs">binary</a> encoding for <a href="/facts/Decimal/7omfVNIM">decimal</a> digits. </p><p>The traditional system of binary encoding for decimal digits, known as <a href="/facts/Binary-coded_decimal/dWTaE7ES">binary-coded decimal</a> (BCD), uses four bits to encode each digit, resulting in significant wastage of binary data bandwidth (since four bits can store 16 states and are being used to store only 10), even when using <a href="/facts/Packed_BCD/dWTaE7ES">packed BCD</a>. </p><p>The encoding reduces the storage requirements of two decimal digits (100 states) from 8 to 7 bits, and those of three decimal digits (1000 states) from 12 to 10 bits using only simple <a href="/facts/Boolean_algebra_(logic)/VkCToAmg">Boolean</a> transformations avoiding any complex arithmetic operations like a <a href="/facts/Base_conversion/31DECoN4">base conversion</a>. </p>