Manchester M listed code modulation device

摘要

PURPOSE:To obtain the modulating device of simple constitution which suits to a CSK communication system by determining one circuit corresponding to sent data between two Manchester M sequence generators at each constant period and sending a CKSmodulated sent signal from an exclusive OR circuit. CONSTITUTION:Two feedback circuits 31a and 31b which are connected to shift registers FF1-FF3 used as two Manchester M sequence generators 31 and 32 and correspond to the Manchester M sequence generators are switched selectively by a switching circuit 33 according to sent data to provide feedback to the inputs of the shift registers FF1-FF3, thereby determining one circuit corresponding to the sent data between the two Manchester M sequence generators 31 and 32. Then the exclusive OR circuit 39 sends out a CSK- modulated sent signal TXO to a transmission line or transmission medium. Consequently, the modulating device of simple constitution for the CSK communication system is obtained.