Direct current telegraphy systems

Details Direct current telegraphy systems Direct current telegraphy systems

H - Electricity

04

L

340/195

H04L 25/49 (2006.01) H04L 25/08 (2006.01)

Patent

CA 1152608

1 PHN 9473 ABSTRACT: An electronic transmitter for direct current telegraphy systems. In order to limit cross-talk between neighboring telegraph lines it is known to filter tele- graph signals prior to transmission to "round-off" their edges. In the present electronic transmitter telegraph signals are given approximately n sinusoidal edges" by the use of a function generator. The electronic transmitter comprises an input circuit, a switching circuit and an output circuit. Binary information signals at an input produce telegraph signals on a telegraph line. The out- put circuit comprises two function generators and a cur- rent source. Two switches in the switching circuit con- trol which function generator is operative in response to command signals D1 and D2 from the input circuit. The result is that current pulses from the current source have exponentially varying leading and trailing edges which approximate the sinusoidal edges.

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