1980-04-21
1982-02-02
Robinson, Thomas A.
179170NC, H04B 158, H04Q 128
Patent
active
043141064
ABSTRACT:
A line circuit comprising a terminal for connection of a wire of a subscriber's line for applying thereto a line current which is determined by the impedance of the subscriber's line and an alternating current which is superimposed on the line current, the circuit further comprising an amplifier and a current injection circuit connected to the output of the amplifier for supplying a portion of the line current, determined by the impedance of the current injection circuit, the amplifier supplying the remaining portion of the line current.
REFERENCES:
patent: 4004109 (1977-01-01), Boxall
patent: 4037065 (1977-07-01), Nahay
patent: 4041252 (1977-08-01), Cowden
patent: 4086447 (1978-04-01), Schindler et al.
patent: 4142075 (1979-02-01), Olschewski
patent: 4203012 (1980-05-01), Boxall
Briody Thomas A.
Robinson Thomas A.
Streeter William J.
U.S. Philips Corporation
Wright Laurence A.
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