Two way telephone amplifier

Details Two way telephone amplifier Two way telephone amplifier

1977-04-11

1978-09-19

Claffy, Kathleen H.

H04M 908

Patent

active

041156587

ABSTRACT:
A two-way telephone amplifier uses a microphone-speaker switching system with the microphone normally on. Incoming or off-line voice signal causes switching to open the transmit line and close the receive line. Features of the invention include a bridge circuit with transmit and receive lines all connected to one side of the secondary of a telephone line coupling transformer.

REFERENCES:
patent: 3725585 (1973-04-01), Moniak
patent: 3970786 (1976-07-01), Randmere
patent: 4002860 (1977-01-01), Terai et al.
patent: 4025728 (1977-05-01), Jacobson

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