Disparity detection circuit for a 2-bit to 4-bit coded signal decoder

摘要

A disparity detection circuit used in a signal decoder which decodes a 4-bit signal into an original 2-bit main signal and 1-bit service signal, from which the 4-bit signal is coded according to a coding rule which stipulates that an original 2-bit main signal and 1-bit service signal should be coded into a 4-bit signal with 1 additional bit added and with pre-determined disparity carrying, determines whether the 4-bit signal conforms to the coding rule and detects the disparity of the 4-bit signal which is determined as conforming to the coding rule.