Q2Digital Electronics
Question
2 marks
Explain the Excess-3 code.
Answer
Excess-3 is an unweighted, self-complementing binary code constructed by adding decimal 3 to standard BCD.
The Excess-3 code is a highly specialized, non-weighted sequential binary coding scheme. It is structurally derived by taking the standard 8-4-2-1 Binary Coded Decimal (BCD) equivalent of a specific decimal digit and mathematically adding 0011 (decimal 3) to it. Its primary engineering advantage is its inherent self-complementing property, simplifying hardware arithmetic.