Telephone speech network

Details Telephone speech network Telephone speech network

1976-12-27

1978-01-31

Claffy, Kathleen H.

179170NC, H04M 158

Patent

active

040717135

ABSTRACT:
An electronic circuit, for connecting a transmitter and receiver to a telephone line. The circuit operates on very low operating voltages from the line which allows parallel operation with a conventional set on long-loop applications. In its functional form, the circuit utilizes a bridge configuration having transistors in two of its legs, driven by the transmitter output, thereby eliminating the usual bridge balancing resistors therefrom and their concomitant operating voltage drops thereacross.

REFERENCES:
patent: 3440367 (1969-04-01), Holtz
patent: 3462560 (1969-08-01), Holzman
patent: 3823272 (1974-07-01), Tabalba
patent: 3955053 (1976-05-01), Picard

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