Adaptive electronic hybrid circuit

Details Adaptive electronic hybrid circuit Adaptive electronic hybrid circuit

H - Electricity

04

B

379/66

H04B 3/03 (2006.01)

Patent

CA 1140692

Abstract An electronic hybrid circuit for matching a two-wire telephone circuit to a four-wire telephone circuit is described. In one embodiment, the circuit includes a variable or adaptive impedance circuit and a first impedance element for supplying a reception signal on the four-wire circuit to a terminal of the two-wire circuit. A second impedance element is connected to supply the recep- tion signal on the four-wire side through the adaptive impedance circuit and an adder is connected to add, in reverse phase, the reception signal appearing at the junction between the second impedance element and the adaptive impedance circuit to a signal provided from the terminal of the two-wire circuit. The resultant output from the adder is a transmission signal on the four-wire side which is fed back to a control terminal of the adaptive impedance circuit where- by the impedance of the adaptive impedance circuit varies depending on the characteristics of the two-wire circuit.

394498

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