Process for converting digital data into a digital signal NRZI encoded.Process for converting a digital signal base divided into a series of words with M data bits in a downconverted signal and apparatus for modular and demodular a digital signal base divided

摘要

A method for converting a digital data into an NRZI-coded digital signal is disclosed which is carried out by the steps of first detecting if the value of every even numbered bit of the digital data is digital zero, second detecting if two bits of the detected even numbered bits having digital zero value and a preceding odd numbered bit have a DC component, producing a detecting signal according to the result of the second detecting; and converting the digital data into the NRZI-coded digital signal by using the detecting signal. An apparatus for converting a digital data into an NRZI-coded digital signal is also disclosed which includes a first means for detecting if the value of every even numbered bit of the digital data is digital zero, a second means for detecting if two bits of the detected even numbered bits having digital zero value and a preceding odd numbered bit have a DC component, a means for producing a detecting signal according to the result of the second detecting, and a means for converting the digital data into the NRZI-coded digital signal by using the detecting signal.