Device for measuring echo return loss in a two-two wire line sys

Details Device for measuring echo return loss in a two-two wire line sys Device for measuring echo return loss in a two-two wire line sys

1997-01-24

1999-08-24

Kuntz, Curtis A.

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Of hybrid or echo suppressor or canceller

379 24, 379406, 379407, 379410, 379415, H04M 124

Patent

active

059433922

ABSTRACT:
The present invention is directed to an adaptor for measuring an echo return loss in a communication system. The adaptor includes two transformers, each having a primary winding and two secondary windings. The secondary windings are cross-connected to form first and second out of phase circuits. The first circuit includes impedance elements which match an impedance of an external device. When the external device is attached to the second circuit, the first and second circuits are schematically equivalent, albeit out of phase. When an oscillation signal is input to one transformer, the matched impedance and out-of-phase connection of the secondary windings cancel the signal such that only an echo signal is output by the other transformer.

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Rugo, Checking Echo Suppressors, Bell Laboratories Record, Mar. 1970.
Oliver, Echo and Singing in Long-Distance Circuits, Telephony, Mar. 1971.
Wittke et al.,Measurement of Echo Parameters Pertinent to High-Speed Full-Duplex Data Transmission on Telephone Circuits, IEEE Journal on Selected areas in Communications, vol. SAC-2, No. 5, Sep. 1984.

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