Arrangement for discriminating signals on a duplex line without

Details Arrangement for discriminating signals on a duplex line without Arrangement for discriminating signals on a duplex line without

1994-07-25

1996-03-26

Safourek, Benedict V.

Multiplex communications

Wide area network

Packet switching

370 321, H04B 320, H04J 308

Patent

active

055027164

ABSTRACT:
In prior-art telecommunication systems a two-wire line carrying digital duplex traffic is tapped by inserting, at a line interruption, two mutually coupled hybrid circuits which convert the two-wire line to a four-wire connection, a traffic stream in one direction being conveyed by two of the four wires and a traffic stream in the other direction being conveyed by the further two of the four wires. A disadvantage for this is that the line has to be interrupted. In the telecommunication system according to the invention the tapping is performed by way of discriminator and echo canceller coupled thereto. The invention is based on the recognition that the traffic stream having the larger amplitude can be discriminated from the digital duplex traffic by way of the discriminator and that, subsequently, the other traffic stream can be discriminated from the digital duplex traffic by way of the echo canceller which echo canceller are supplied with both the digital duplex traffic coming from the line and the traffic stream that has the larger amplitude coming from the discriminator.

REFERENCES:
patent: 4220816 (1980-09-01), Howells et al.
patent: 4570036 (1986-02-01), Virdee
patent: 4581492 (1986-04-01), Virdee
patent: 4591669 (1986-05-01), Duttweiler et al.
patent: 4604740 (1986-08-01), Gandini et al.
patent: 4845658 (1989-07-01), Gifford
patent: 4864617 (1989-09-01), Holmquist
patent: 5181198 (1993-01-01), Lechleider

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