Adaptive electronic hybrid circuit

Details Adaptive electronic hybrid circuit Adaptive electronic hybrid circuit

1979-04-10

1981-08-18

Wolff, John H.

179170D, H04B 158

Patent

active

042848598

ABSTRACT:
An adaptive hybrid circuit for connecting two-wire and four-wire telephone transmission lines to minimize singing, oscillation or echoes due to impedance mismatch. The circuit comprises a variable impedance circuit connected between the two-wire and four-wire circuits. In one embodiment one end of the variable impedance circuit is connected to the two-wire circuit and to one input of an adder to which the reception signal from the four-wire circuit is also applied and compared in reverse phase and half amplitude. The resulting transmission signal is used to adjust the variable impedance circuit so as to minimize the transmission signal. In another embodiment the variable impedance element is connected to an impedance through which the four-wire reception signal is applied and is further connected to one input of an adder which compares this input in reverse phase with the two-wire signal to produce a transmission signal. This transmission signal is also used to adjust the variable impedance circuit to minimize the transmission signal.

REFERENCES:
patent: 3982080 (1976-09-01), Ukeiley
patent: 4096361 (1978-06-01), Crawford
patent: 4103118 (1978-07-01), Bergman
patent: 4174470 (1979-11-01), Seidel
patent: 4181824 (1980-01-01), Seidel

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