The output sequences of them also have strong auto correlation and weak cross correlation by computer, so when the code length is fixed, they can afford to more code word.

The Hamming distance is used in telecommunication to count the number of flipped bits in a fixed-length binary word, an estimate of error, and so is sometimes called the signal distance.

The entropy coding methods which adopted fixed code table and probability model are improved to adaptive context-based alterable word length coding.