Electronic impedance-matched line repeater

Details Electronic impedance-matched line repeater Electronic impedance-matched line repeater

H - Electricity

04

M

379/68

H04M 7/00 (2006.01) H04B 1/58 (2006.01) H04M 19/00 (2006.01)

Patent

CA 1195446

ABSTRACT OF THE DISCLOSURE An electronic line repeater for connecting a two-wire line to a subscriber exchange is impedance-matched to the two- wire side with the aid of a feedback circuit from the two- wire side of the repeater to the incoming four-wire side. The feedback includes a differential amplifier which senses the speech voltage drop on the two-wire side, and a resistor connected to the line amplifier of the repeater. Impedance matching can be achieved by definite values of the gain pro- vided by the differential amplifier and the line amplifier.

421186

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