Speakerphone state-controlled alerting arrangement

Details Speakerphone state-controlled alerting arrangement Speakerphone state-controlled alerting arrangement

1990-08-01

1992-12-15

Dwyer, James L.

Telephonic communications

Special services

Call waiting

379373, 379375, 379388, 379390, H04M 342

Patent

active

051724081

ABSTRACT:
A telephone station set (100) alerting arrangement preferably uses a a speakerphone loudspeaker (140) to produce audible alerting signals (e.g., ringing signals )from locally-generated (105, 115) alerting signals both when the set is on-hook and when the set is off-hook. The present state of the speakerphone control circuit (102) is used to control the volume of the produced audible alerting signals: high-volume alerting signals are supplied to the loudspeaker when the control circuit (102) is used to control the volume of the produced audible alerting signals: high-volume alerting signals are supplied to the loudspeaker when the control circuit is in talking state (202), and low-volume, attenuated alerting signals are supplied to the loudspeaker when the control circuit is in listening state (201). The appearance of alerting signals when the speakerphone control circuit is in idle state (200) causes the speakerphone circuit to make a transition to the talking state.

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Gary Kloesz & Dennis Morgan, Hands Free Telephone Conversations are Simplified Using New Integrated Circuits, IEEE Transactions on Consumer Electronics, vol. CE-31, No. 3, Aug. 1985, 552-559.
"Motorola MC34018 Speakerphone Network", product specification, pp. 2-249 to 2-250, Motorola Semiconductor, Inc.
"Voice Switched Speakerphone Circuit", product description, IC Master catalog, p. 2944, (1988).

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