Line equalizer

Details Line equalizer Line equalizer

1982-11-24

1985-02-19

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

333 18, 333 28R, H04B 314

Patent

active

045009996

ABSTRACT:
A line equalizer including a .sqroot.f equalizer for compensating a .sqroot.f-characteristic of a transmission line, a BT equalizer connected in series with the .sqroot.f equalizer for removing an echo component caused by a bridged tap (namely, BT) on the transmission line, and a circuit for controlling the .sqroot.f equalizer is disclosed. A signal applied to the .sqroot.f equalizer is subjected to over-equalization to make the time domain length of impulse response at the output of the .sqroot.f equalizer small. The equalization state of the output of the .sqroot.f equalizer is judged by signals formed in the BT equalizer, and the gain of the .sqroot.f equalizer is controlled on the basis of the result of judgement. In this manner, the .sqroot.f equalizer is controlled without suffering any interference between a control loop of the .sqroot.f equalizer and a control loop of the BT equalizer.

REFERENCES:
patent: 3775688 (1973-11-01), Hinoshita et al.
patent: 3879664 (1975-04-01), Monsen
patent: 4253184 (1981-02-01), Gitlin et al.
patent: 4298983 (1981-11-01), Kawai et al.
patent: 4388724 (1983-06-01), Gockler
patent: 4422175 (1983-12-01), Bingham et al.

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