Electronic speech circuit for a central battery telephone set

Details Electronic speech circuit for a central battery telephone set Electronic speech circuit for a central battery telephone set

1975-02-13

1976-08-10

Claffy, Kathleen H.

179170NC, H04M 158

Patent

active

039743446

ABSTRACT:
An electronic speech circuit for a central battery telephone set in the form of a Wheatstone bridge has for one arm of the bridge the impedance of the incoming line to the set and for another arm an impedance mainly equal to the line impedance. The remaining arms consist of resistance impedances, preferably resistors. The DC-terminals of the transmitter amplifier are connected in the bridge diagonal which is connected between the two resistors, and the other bridge diagonal is formed by the signal path of the receiver amplifier, the DC-terminals of which are connected to one of the resistors and to the line simulating impedance.

REFERENCES:
patent: 3462560 (1969-08-01), Holzman
patent: 3742153 (1973-06-01), Matsuda
patent: 3748400 (1973-07-01), Ritz

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