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US 4,922,490 AGranted
Telephone station set
AssigneeAmerican Telephone and Telegraph Company
InventorJames R. Blakley
Life of this patent
Estimating the term…
Abstract
A communication station capable of transmitting audible speech represented by speech signals received on the line during the on-hook state. A calling party name may be spoken at the station without requiring the call to be answered. The station is also usable, while on-hook, for receiving voice messages, e.g., emergency warnings, transmitted from a central office or customer premises switch.
Claims4
An ISDN speakerphone station set connectable to a digital subscriber line comprising first and second B-channels and a D-channel, said station set comprising
- switch-hook means having on-hook and off-hook states,
- splitter/combiner means for digitally interfacing said first and second B-channels and said D-channel of said line with a first B-channel path, a second B-channel path, and a D-channel path, respectively,
- a first coder/decorder for converting between digital voice signals, received from said first B-channel via said splitter/combiner means and said first B-channel path, and analog voice signals,
- a second coder/decoder for converting between digital voice signals, received from said second B-channel via said splitter/combiner means and said second B-channel path, and analog voice signals,
- a station set speaker,
- speaker switch means having a first position for connecting said first coder/decoder with said speaker and having a second position for connecting said second coder/decoder with said speaker, and
- station set controller means responsive to receipt, during the on-hook state of said switch-hook means, of a message from said D-channel via said splitter/combiner means and said D-channel path for placing said speaker switch means in said second position to couple a voice announcement on said second B-channel via said splitter/combiner means and said second coder/decoder to said speaker.
4 more elements
Dependencies are inferred from the claim text.