Direct current telegraphy systems

Details Direct current telegraphy systems Direct current telegraphy systems

1980-05-16

1982-04-27

Robinson, Thomas A.

Telegraphy

Systems

Automatic

328163, 375 58, H04B 162, H03K 1302, H04L 1500

Patent

active

043272495

ABSTRACT:
An electronic transmitter for direct current telegraphy systems. In order to limit cross-talk between neighboring telegraph lines it is known to filter telegraph signals prior to transmission to "round-off" their edges. In the present electronic transmitter telegraph signals are given approximately "sinusoidal edges" by the use of a function generator. In FIG. 1 an electronic transmitter comprises an input circuit 1, a switching circuit 2 and an output circuit 3. Binary information signals at an input produce telegraph signals on a telegraph line 6-6'. The output circuit 3 comprises two function generators 15 and 17 and a current source 21. Switches 11 and 14 in the switching circuit 2 control which function generator is operative in response to command signals D.sub.1 and D.sub.2 from the input circuit. The result is that current pulses from the current source 21 have exponentially varying leading and trailing edges which approximate the sinusoidal edges as shown in FIG. 2.

REFERENCES:
patent: 3523291 (1970-08-01), Pierret
patent: 3806807 (1974-04-01), Nakamura
patent: 4156202 (1979-05-01), Takahashi

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