Electronic circuit to reduce noise in digital subscriber...

Details Electronic circuit to reduce noise in digital subscriber... Electronic circuit to reduce noise in digital subscriber...

2007-04-03

2007-04-03

Swerdlow, Daniel (Department: 2615)

Telephonic communications

Transmission line conditioning

Interference suppression

C330S258000, C324S625000

Reexamination Certificate

active

10893158

ABSTRACT:
In order to reduce noise in telecommunications made over unshielded twisted pair (UTP) of metallic conductors an active electronic circuit for a two-to-four wire hybrid circuit reduces common mode signals without recourse to inductive components. The hybrid has a balance network that dynamically alters its impedance to closely balance with the two wire line impedance. Residual common mode signals are cancelled. Resistors are connected to the wires and the circuit generates a high impedance to differential mode signals and a virtual ground to common mode signals.

REFERENCES:
patent: 4387277 (1983-06-01), Gilles et al.
patent: 5249225 (1993-09-01), Williams
patent: 5602912 (1997-02-01), Hershbarger
patent: 5859564 (1999-01-01), Sonntag et al.
patent: 6681012 (2004-01-01), Gorcea et al.
patent: PCT/US04/22985 (2004-11-01), None
“The Twisted-Pair Telephone Transmission Line”, by Richard Lao of Sumida America Technologies, From Nov. 2002 High Frequency Electronics.
“Common mode voltage in telephone lines and its influence on measurements” by Rolands Parts, Lattlekom Testing Laboratory, Dzimavu iela 16, LV-1010, Latvia.
“Copper Lines and High Speed” by Peter Ziemann of Wandel & Goltermann GmbH, Germany.

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