Introduction - If you have any usage issues, please Google them yourself
The signed digit (SD) system differs the traditional binary systems
presented in the previous section in the fact that it is ternary valued (i.e.,
digits have the value {0, 1,− 1}, where − 1 is sometimes denoted as 1).
SD numbers have proven to be useful in carry-free adders or multipliers
with less complexity, because the effort in multiplication can typically be