Tone injection circuit

Details Tone injection circuit Tone injection circuit

1974-12-30

1976-01-06

Cooper, William C.

179 84VF, H04Q 144

Patent

active

039314740

ABSTRACT:
A precise tone injection circuit for injecting tone signals to a constant current junctor circuit in a two-wire balanced circuit. The tone injection circuit includes a pair of transistors operating as constant current sources feeding the respective ones of the two wires. A phase splitter amplifier couples a tone signal to the base electrodes of the transistors to change the current through their collector electrodes via the emitter circuits thereof at a rate and frequency of the tone signals at the base. Since a two-wire balanced circuit is used, and the injected signal currents to each wire are 180.degree. out-of-phase, in-phase signals, that is, noise and voltage fluctuations, are reduced or rejected.

REFERENCES:
patent: 3764753 (1973-10-01), Wisotzky

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