Handsfree circuit for telephone instrument

Details Handsfree circuit for telephone instrument Handsfree circuit for telephone instrument

H - Electricity

04

M

379/81

H04M 1/60 (2006.01) H04M 9/10 (2006.01)

Patent

CA 1215187

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.

456201

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