Circuit arrangement for signal and information conversion betwee

Details Circuit arrangement for signal and information conversion betwee Circuit arrangement for signal and information conversion betwee

1991-03-14

1994-02-22

Dwyer, James L.

Telephonic communications

Subscriber line or transmission line interface

Hybrid circuit

379399, 379339, H04M 300

Patent

active

052895386

ABSTRACT:
A circuit arrangement converts signals and information between analog junction lines and digital terminal devices in communications exchanges. A decentralized control device is provided in order to process and pass on switching criteria and codes received and sent to the respective analog junction line, inside and outside the audio frequency band, the circuit arrangement including a plurality of line interfaces, each coupled directly to a respective one of the decentralized control devices, for the switching criteria and codes to be exchanged outside of the audio frequency. At least one digital signal processor is provided for processing the codes to be exchanged within the audio frequency band, the digital signal processor being looped in via a hybrid connection and converter in a speech path which cooperates with the control device. A digital terminal interface is responsive to the control device and the signal processor, the digital terminal interface being modulated by the control device and the signal processor to provide a plurality of useful channels and at least one signaling channel.

REFERENCES:
patent: 4110560 (1978-08-01), Leary et al.
patent: 4270027 (1981-05-01), Agrawal et al.
patent: 4456991 (1984-06-01), Chea, Jr. et al.
patent: 4759059 (1988-07-01), Christensen
patent: 4852160 (1989-07-01), Kiko et al.
patent: 4894864 (1990-01-01), Cook
patent: 5133006 (1992-07-01), Khuat
patent: 5151936 (1992-09-01), Riedle

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