Data transmission system

Details Data transmission system Data transmission system

H - Electricity

04

L

325/28

H04L 27/02 (2006.01) H04L 1/00 (2006.01) H04L 5/14 (2006.01) H04L 25/49 (2006.01) H04L 27/06 (2006.01)

Patent

CA 1134447

ABSTRACT 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 be- tween 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.

346849

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