Apparatus and method of recognizing establishment of speech chan

Details Apparatus and method of recognizing establishment of speech chan Apparatus and method of recognizing establishment of speech chan

1997-05-27

1999-07-20

Weaver, Scott

Telephonic communications

Audio message storage, retrieval, or synthesis

Dynamic audio signal recording or reproduction

379350, H04M 320

Patent

active

059265230

ABSTRACT:
An apparatus for recognizing an establishment of speech channel in communication appliances connected in parallel to a common telephone line includes a hook switching unit for establishing a speech channel between the telephone line and a selected one of the communication appliances in accordance with a switch-on control signal, and for cutting off the established speech channel in accordance with a switch-off control signal; a detecting unit, connected to the telephone line and adapted to detect a loop current from the telephone line; a storage unit for storing a value of the loop current detected from the detecting unit as a one-channel value when the speech channel is initially established between the telephone line and the selected one of the communication appliances, and a control unit for generating the switch-on control signal to the hook switching unit in response to an incoming call, and for generating the switch-off control signal to the hook switching unit for switching a call conversation to another communication appliance connected in parallel to the telephone line when the value of the loop current output from the detecting unit is lower than the one-channel value while the selected one of the communication appliances is playing back a recorded message to the telephone line in an automatic telephone answering mode.

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