DEVICE FOR CODING RECEPTION AND TRANSMISSION OF DIGITAL INFORMATION OVER TWO-WIRE COMMUNICATION LINE Russian patent published in 1998 - IPC

FIELD: electrical engineering, in particular, successive data reception and transmission systems. SUBSTANCE: one logical signal is applied to input TxD of logical-to-differential signal converter 7, at the direct output the signal passes via resistors 8,9 and is applied to the control input of gate 10, it also passes via accelerating capacitor 11 to the control input of gate 10; at the same time from the direct output the signal passes to the control input of gate 14 via resistor 15, capacitor 19, diode 16; as a result, a negative-polarity pulse is produced in the output windings of matching and decoupling device 4. At arrival of logic zero to the input of logical-to-differential signal converter 7 at the inverse output the signal passes via parallel-connected resistor 12 and accelerating capacitor 13 to the control input of gate 14, at the same time from the inverse output the signal is fed via resistor 17, capacitor 20, diode 18 to the control input of gate 10. As a result, a positive-polarity pulse is produced in the output windings of matching and decoupling device 4 a logic zero is set up at inverse output TKD of comparator 21, and at arrival of negative pulse to the second secondary winding of matching and decoupling device 4 a logic one is set up at inverse output TxD of comparator 21. Channels interlocking signal is applied to the control input of gate 27 from the control unit. EFFECT: electric scanning between receiver and transmitter, employment in long-distance communication lines. 1 dwg