Telephone line circuit

Details Telephone line circuit Telephone line circuit

1981-09-03

1983-08-30

Shoop, William M.

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

179 18FA, H02M 3335

Patent

active

044020392

ABSTRACT:
A floating, constant power, battery feed circuit wherein a single transformer is used to perform the functions of battery feed and audio coupling. AC feedback is used to control the dynamic output impedance of the circuit. To achieve a constant dynamic output impedance, the amount of AC feedback is controlled by the DC output voltage, which in turn depends on the loop resistance. To achieve a constant audio gain from the switching network to the subscriber set, the audio signal from the switching network is multiplied by a signal representing the DC output voltage.

REFERENCES:
patent: 4011410 (1977-03-01), Thomas
patent: 4056689 (1977-11-01), Freimanis
patent: 4119806 (1978-10-01), Baratin
patent: 4124884 (1978-11-01), Episcopo
patent: 4335423 (1982-06-01), Koizumi et al.
patent: 4347559 (1982-08-01), Sturgeon

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