Voice frequency repeater and term sets and other circuits theref

Details Voice frequency repeater and term sets and other circuits theref Voice frequency repeater and term sets and other circuits theref

1980-02-11

1982-05-25

Canney, Vincent P.

179170R, H04B 158

Patent

active

043318428

ABSTRACT:
An electronic hybrid voice frequency repeater having a pair of term sets interconnected by a four-wire circuit for separating the two directions of signal transmission and amplifying each direction separately. Each term set couples the repeater's four-wire circuit to a two-wire line and has a differential current driver for driving the two-wire line and a differential amplifier connected in a feedback loop for sensing the differential signal voltage across the two-wire line, to drive the current driver and to feed an incoming differential signal on the two-wire line to the repeater's four-wire circuit while nulling signals arriving at the term set from the four-wire circuit to prevent them from returning to the four-wire circuit. Other features disclosed include a low frequency clamping circuit, an adjustable-gain amplifier, and an equalizer for non-loaded cable.

REFERENCES:
patent: 3700831 (1972-10-01), Aagaard et al.
patent: 3849609 (1974-11-01), Voorman
patent: 3970805 (1976-07-01), Thomas
patent: 4041252 (1977-09-01), Cowden
patent: 4053722 (1977-10-01), Nahay

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