Tabular construction of balanced codes

Symmetries in the encoding of balanced sequences are exploited to simplify a tabular approach for constructing balanced codes, and it is shown that with appropriate assignment of source word probabilities, these symmetries ensure the absence of discrete components in the spectrum of the encoded signal. He is further shown that assigning appropriate priorities to codewords during table construction results in superior low-frequency performance, and the use of these techniques is demonstrated in the construction of a balanced QPSK code.