One way Billy can improve his ability to encode information is by using a Dual Coding process.
比利可以提高他编码信息能力的一种方法是使用“双重编码”过程。
英语百科
Dual code
In coding theory, the dual code of a linear code
is the linear code defined by
where
is a scalar product. In linear algebra terms, the dual code is the annihilator of C with respect to the bilinear form <,>. The dimension of C and its dual always add up to the length n: