Audio teleconferencing

Details Audio teleconferencing Audio teleconferencing

1978-12-05

1981-05-19

Konick, Bernard

179 18BC, H04M 356

Patent

active

042687160

ABSTRACT:
A control unit for establishing a four-wire connection between two terminals via a pair of telephone lines comprises switching means which are operable to provide a connection to a pair of telephone lines, signalling means connectible to said lines via said switching means to enable another control unit to be signalled via a line, and line send and receive circuitry connected to the switching means. The line send and receive circuitry has an input for connection to the send channel of a terminal and an output for connection to the receive channel of the terminal. A central control controls operation of the switching means and line send and receive circuitry to automatically establish a four-wire connection and adjust parameters of the line send and receive circuitry to compensate for loss on the telephone line.

REFERENCES:
patent: 3515807 (1970-06-01), Clark
patent: 3983332 (1976-09-01), Patten
patent: 4046966 (1977-09-01), Urui
patent: 4197429 (1980-04-01), Sparber

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