Arrangement for applying a signal to a transmission line

Details Arrangement for applying a signal to a transmission line Arrangement for applying a signal to a transmission line

1979-06-22

1981-05-12

Robinson, Thomas A.

H04M 1900

Patent

active

042674085

ABSTRACT:
An electronic circuit for applying a signal to a telephone line is disclosed wherein the signal to be transferred is superimposed on a direct current and applied to the reference voltage circuit of a bidirectional current source. The current source in turn applies, from high internal resistances, oppositely directed currents which are equal to each other and proportional to the signal onto the two wires of the telephone line.

REFERENCES:
patent: 4087647 (1978-05-01), Embree et al.

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