Being the digital transmission device which can give aperiodic in the data the digital transmission device and the digital

摘要

PROBLEM TO BE SOLVED: To exactly establish synchronism by preventing the data from becoming a continuation of specified symbol patterns for a long time. ;SOLUTION: A digital transmitter 100 is provided with a data inverting part 101 for inverting bit streams within the determined range of data when the presence of aperiodicity is not confirmed, a shift register line 102 for scrambling for applying scramble processing to the output of the data inverting part 101, a comparing part 103 for storing the state of the shift register line 102 for scrambling in a preceding frame and comparing that state with the state of the shift register line 102 for scrambling in a present frame to show whether the states are equal or not, a counter 104 for updating a value on the basis of the result of the comparing part 103, an inversion instructing part 105 for deciding the presence of aperiodicity on the basis of the value of the counter 104 and outputting an inverting instruction to the data inverting part 101, and a modulating processing part 120 for modulating the output of the shift register line 102 for scrambling and transmitting the output to the outside.;COPYRIGHT: (C)2003,JPO