Handsfree circuit for telephone instrument

Patent

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Details

179100L, H04M 908

Patent

active

044979800

ABSTRACT:
A handsfree or loudspeaking telephone circuit employing loudest speaker comparison for controlling the direction of transmission of speech signals. The circuit employs the speech network for the handset to provide gain and hybrid functions. The circuit contains logic for controlling the switching between handset operation, handsfree operation and call announcing operation.

REFERENCES:
patent: 4115659 (1978-09-01), Spanel et al.

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