Automatic signal level adjusting circuits for use in telephone s

Details Automatic signal level adjusting circuits for use in telephone s Automatic signal level adjusting circuits for use in telephone s

1977-10-25

1979-03-06

Claffy, Kathleen H.

179 16F, H04M 100

Patent

active

041432479

ABSTRACT:
There are provided a current detecting resistance element connected in series with a loop for supplying current to a telephone set, a switching circuit including a three terminal semiconductor switching element connected to be ON.OFF controlled by the voltage drop across the resistance element, and an impedance element controlled by the ON.OFF operation of the switching element to be connected across the loop for adding AC loss.

REFERENCES:
patent: 3989902 (1976-11-01), Coupland

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