Two-wire/four-wire converter

Details Two-wire/four-wire converter Two-wire/four-wire converter

1991-03-27

1992-12-15

Dwyer, James L.

Telephonic communications

Subscriber line or transmission line interface

Hybrid circuit

379399, 379400, 379345, 333 32, H04M 1100

Patent

active

051724111

ABSTRACT:
A two-wire/four-wire converter for coupling a two-wire communications path carrying analog transmission and reception signals to a four-wire communications path having a two-wire transmission path carrying digital transmission signals and a two-wire reception path carrying digital reception signals, includes an analog/digital converter having an input coupled to the two-wire communications path and an output coupled to the two-wire reception path. An adder has one input connected to the two-wire reception path and another input connected to the two-wire transmission path. A digital filter with an adjustable communications function generates a predetermined terminating impedance for the two-wire transmission path. The digital filter has an input connected to the output of the adder and an output. A subtractor has one input connected to the output of the digital filter, another input coupled to the output of the analog/digital converter and an output. A digital/analog converter has an input coupled to the output of the subtractor and an output. A resistor is connected between the output of the digital/analog converter and the input of the analog/digital converter.

REFERENCES:
patent: 4161633 (1979-07-01), Treiber
patent: 4178569 (1979-12-01), Reutter et al.
patent: 4351060 (1982-09-01), Treiber
patent: 4381561 (1983-04-01), Treiber
patent: 4796296 (1989-01-01), Amada et al.
Siemens Forschungs- und Entwicklungsberichte, Vl. 5, No. 5, 1986, pp. 253-258; Vogel et al.: "A Signal-Processing Dodec Filter for PCM applications"; p. 254, left column, line 33.

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