Electronic DX signaling circuit

Details Electronic DX signaling circuit Electronic DX signaling circuit

1977-05-06

1978-07-18

Robinson, Thomas A.

Telegraphy

Systems

Printing

H04L 2502

Patent

active

041017331

ABSTRACT:
A duplex transmission circuit using electronic components in place of either the multiple winding polar relays or combinations of differential amplifiers currently being used. In the circuit, algebraic additions and subtractions of voltage are performed and the results compared within an operational amplifier to produce the known outputs for E and M signaling in telecommunications systems. An additional operational amplifier is provided to produce a delayed response to signals of longer than a predetermined duration.

REFERENCES:
patent: 3566031 (1971-02-01), Carbone et al.
patent: 3725582 (1973-04-01), Davis
patent: 3999013 (1976-12-01), Reed et al.

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