Speech-amplifier telephone station
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United States of America Patent
Stats
-
Dec 11, 1984
Grant Date -
N/A
app pub date -
Dec 16, 1982
filing date -
Dec 18, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
First Claim
Family
International Classification(s)
Cited Art Landscape
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