Speech-amplifier telephone station

Details Speech-amplifier telephone station Speech-amplifier telephone station

1982-12-16

1984-12-11

George, Keith E.

H04M 160

Patent

active

044880073

ABSTRACT:
The telephone station has a first attenuator inserted in a transmission channel, and a second attenuator inserted in a reception channel. Each attenuator has a variable impedance mounted in shunt on the corresponding channel. A circuit controls the attenuators as a function of the relative levels of signals collected respectively from the transmission and reception channels. A bridge circuit introduces a difference between the levels of the signals collected respectively from the two channels. The bridge circuit includes a resistor bridge formed by two fixed resistors inserted in each channel upstream of the attenuator which is associated with said channel, and by a variable impedance which constitutes the attenuator. The common node of the two fixed resistors is the point of collection of the signal from each channel.

REFERENCES:
patent: 3894187 (1975-07-01), Shibata et al.
patent: 4317959 (1982-03-01), Kuriki
Rev. of Elec. Comm. Lab's, vol. 24, No. 3-4, 1976, Tokyo, K. Kato "A Voice Switching Circuit . . . ", pp. 235-245.
B. Copping, "Designing a Voice Switching . . . ", The Post Office Electrical Engineer's J., vol. 60, No. 1, 1967, pp. 65-67.

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