Consequently, the result of this recoding (addition) is
qi = 2;i -~- k i
2.106
with
qi E
{-2, -1, 0, 1}. Note that the computation ofqi does not have to be
done explicitly; that is, it can be kept as
zi
and
hi.
Recoding 2
qi
= 2ti+l -+-w
i E
{-2,-1, 0, 1}
2.107
such that
ti
~ {-1, 0} and
wi E
{0, 1}.
Consequently,
Si -- Wi -+- ti E
{-1, 0, 1} 2.108
Method 2: Using information from previous digit position. As before,
1.
Xi
+ Yi
= ...
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