Ternary signal

As a ternary signal a signal from three states will be referred to in the information technology. A notation of state is "-1", "0" and "1". Thus it represents an alternate encoding of a digital signal, which is usually two states (binary ) assumes that can be denoted by "0" and "1". This is what we call binary.

A ternary signal ( more than two states ) can be used to save bandwidth and transmit dc-free. Here, the bandwidth is ideally about 63 % of the bandwidth required for binary transmission. In practice, codes are often used, which require more than this minimum bandwidth, but with additional redundancy enable clock recovery, error detection or correction.

From pseudoternärem signal is called then, though if one uses three signal states, but only a binary mapping it. A logic "1 " is thus transferred as 1 and -1 as to the next. The potential gain in bandwidth is not used, but only through this "trick " is a decoding via cable runs possible.