DATA TRANSMISSION SYSTEM

摘要

A data transmission system is disclosed in which a transmitter always transmits a carrier to a receiver and modulates the carrier by means of data to be sent. The receiver has a demodulator for recovering the data sent during a communication period. The transmitter includes a sending code convertor which inverts specified bits of the data being sent in the data sending period of the total communication period. The receiver includes a detector which detects whether the data demodulated during the communication period has been subjected to bit inversion or not and so can discriminate between the data sending period and the "pause" period which is the period within the communication period during which no data is actually being sent. The receiver also has a code converter which decodes the demodulated data received.