Line circuit

Details Line circuit Line circuit

H - Electricity

04

M

379/67

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

Patent

CA 1195018

ABSTRACT OF THE DISCLOSURE For the purpose of realizing a line circuit, especially a two-wire four-wire conversion circuit of a telephone exchange in the form of LSI and providing the conversion circuit with an impedance which is suitable to a side tone characteristic of the telephone set, in a line circuit composed of a hybrid circuit wherein the four-wire input line is connected to the two-wire subscriber line via a buffer amplifier and a terminating impedance and in addition the four-wire output line is connected to the output of a subtractor which subtracts an input signal of the four-wire input line passed through a filter circuit from a signal fed from the two- wire subscriber line, the terminating impedance is formed by a resistor component and in addition a feed- back circuit having such a transfer characteristic that the impedance of the line circuit seen from the two-wire subscriber line side will become a specified complex impedance is installed between a line which couples the two-wire subscriber line to the subtractor and an input of the buffer amplifier.

416750

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