Circuit and method for automatically cutting off a speech path a

Details Circuit and method for automatically cutting off a speech path a Circuit and method for automatically cutting off a speech path a

1996-07-03

2000-04-25

Isen, Forester W.

Telephonic communications

Supervisory or control line signaling

Using line or loop condition detection

379377, 379420, H04M 900

Patent

active

06055309&

ABSTRACT:
A method for performing a speakerphone function in a cordless telephone contemplates the steps of: forming a speakerphone speech path to enable the speakerphone function in response to user input of a speakerphone key, detecting a busy tone signal received from a telephone line while the speakerphone speech path is formed, and automatically interrupting the speakerphone speech path to disable the speakerphone function in response to detection of the busy tone signal. The speakerphone speech path is automatically interrupted by controlling a hook relay to disconnect the telephone line from a voice processor that transmits and receives voice signals, and controlling an electrical switch to disconnect the voice processor from a microphone that generates the voice signals from a user's speech and a speaker that aurally transmits the voice signals received from the telephone line via the voice processor.

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