DIGITAL SIGNAL MODULATION METHOD, DIGITAL SIGNAL MODULATOR, AND DIGITAL SIGNAL RECORDING MEDIUM

摘要

PROBLEM TO BE SOLVED: To provide a method for generating a digital modulation signal for DSV(digital sum value) control with high performance producing no low frequency component in the case of generating the digital modulation signal by run length coding and NRZI(non return to zero inverted recording) conversion by a prescribed method.;SOLUTION: A synchronous word generating means 123 generates 1st and 2nd synchronous words from which number of inversion times, resulting in different polarities are obtained through the NRZI conversion, an address generating section 122 generates 1st and 2nd coded sequence data by allocating generated coded data to the two synchronous words, while referring to a run length coding table 13, a peak value comparison section 129 compares DSV arithmetic result stored in DSV arithmetic peak value memories 126, 127 receiving coded sequence data with a smaller DC component caused at the NRZI conversion among the coded sequence data and selects and obtains the coded sequence data obtained as the smaller DC component data.;COPYRIGHT: (C)2003,JPO