Interface circuit interconnecting a bidirectional two-wire line

Details Interface circuit interconnecting a bidirectional two-wire line Interface circuit interconnecting a bidirectional two-wire line

1984-05-01

1986-08-26

Rubinson, Gene Z.

179170NC, 1791706, H04B 320, H04B 158

Patent

active

046084649

ABSTRACT:
In an interface circuit which couples a two-wire line of bidirectional transmission and unidirectional four-wire receiving and transmitting lines; in order to permit the interface circuit to operate in adaptation to the fluctuation of an impedance with the two-wire line side viewed from the four-wire receiving line, the four-wire receiving line is provided with a plurality of filters and a group of switches for selecting the filters, an output of the four-wire transmitting line is compared with outputs obtained by scanning the filters, and the filter providing the minimum output difference in the comparisons is selected and connected.

REFERENCES:
patent: 3787645 (1974-01-01), Ochiai et al.
patent: 3828147 (1974-08-01), Ochiai et al.
patent: 4232400 (1980-11-01), Yamamoto et al.
patent: 4275270 (1981-06-01), de la Plaza
K. Ochiai, T. Araseki, T. Ogihara; "Echo Canceller with Two Echo Path Models"; IEEE Transactions on Communications; vol. Com. 25; No. 6; Jun. 1977; pp. 589-595.

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