Signed-digit representations

Question

I've been reading about signed-digit representations of numbers and I wanted to confirm that my general understanding was correct.

As I understand it, a signed-digit representation allows for fast addition of integers, however as a consequence we now have non-unique representations of numbers. If we select the signed digit representation of balanced ternary however, there is a special representation called the Non-Adjacent form that guarantees a unique representation of any number.

Is this correct?

Answer 1

Figured this out on my own, the Non-Adjacent Form isn't in base ternary, its a special case of binary using three symbols