Active impedance transformer assisted line feed circuit

Details Active impedance transformer assisted line feed circuit Active impedance transformer assisted line feed circuit

1982-08-06

1984-11-20

Brown, Thomas W.

179 16F, 179 70, H04M 176, H04M 1900

Patent

active

044840322

ABSTRACT:
A transformer assisted active impedance line circuit includes a transformer of reduced size as compared to both conventional and d.c. flux reduced transformer line circuits. The transformer has tip and ring primary windings consisting of equal turns and a secondary winding. Tip and ring amplifier circuits each have an output coupled to tip and ring terminals via tip and ring feed resistors which are connected in series with the tip and ring primary windings respectively. A direct current flow, out of the output of one of the amplifier circuits and into the output of the other of the amplifier circuits via two wire communication line connected to the tip and ring terminals, is of an aiding flux-generating effect in the transformer. The secondary winding is terminated by an impedance and provides a.c. signals to which the tip and ring amplifier circuits are responsive to reduce a.c. voice signal current components in the communication line.

REFERENCES:
patent: 3955052 (1976-05-01), Orbach
patent: 4087647 (1978-05-01), Embree et al.
patent: 4110636 (1978-08-01), Dijkmans
patent: 4433213 (1984-02-01), Albers et al.

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