Echo measurement arrangement

Details Echo measurement arrangement Echo measurement arrangement

1989-10-27

1990-08-07

Ng, Jin F.

Telephonic communications

Subscriber line or transmission line interface

Network interface device

370 321, H04B 323

Patent

active

049474251

ABSTRACT:
A digital signal processor is provided with the facility to range and converge on each of a plurality of echoes occurring at respective locations along a communications line. Specifically, the digital signal processor is arranged to adaptively process samples of a signal that has been transmitted to the communications line correlated with samples of a signal that have been received from the communications line. In the processing of the samples, the digital signal processor separates and measures the magnitude of each echo that it converges on, beginning with a so-called near-end echo. In addition, the digital signal processor calculates the propagation delay of each echo that it converges on using the number of sampling intervals that have been processed in order to position the processor on the dispersion of that echo.

REFERENCES:
patent: 4649335 (1987-03-01), Lassaux et al.
patent: 4742510 (1988-05-01), Quatieri et al.
patent: 4764955 (1988-08-01), Galand et al.
patent: 4805215 (1989-02-01), Miller
patent: 4813073 (1989-03-01), Ling
"Measurements of Echo Parameters Pertinent to High-Speed Full-Duplex Data Transmission on Telephone Circuits", IEEE Journal on Selected Areas in Comms., Sep. 1984, P. H. Wittke et al, pp. 703-710.

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