Systems and methods for reducing noise in ADSL transmissions

Telephonic communications – Substation or terminal circuitry – Noise suppression

Reexamination Certificate

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Reexamination Certificate

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07155007

ABSTRACT:
A system (242) processes asymmetric digital subscriber line (ADSL) signals. The system (242) receives a signal that includes an ADSL signal and transient noise (230). The system (242) isolates the transient noise (230) in the signal and retrieves the ADSL signal from the signal using the isolated transient noise (230).

REFERENCES:
patent: 6741739 (2004-05-01), Vincent
David L. Donoho et al.; “Threshold Selection for Wavelet Shrinkage of Noisy Data”; Proc. 16thAnnual Intl. Conf. Of the IEEE Engineering in Medicine Biology Society; Nov. 1994; pp. 24a-25a.
David L. Donoho; “De-Noising by Soft-Thresholding”; IEEE Trans. On Information Theory; vol. 41, No. 3; May 1995; pp. 613-627.
John W. Cook et al.; “The Noise and Crosstalk Environment for ADSL and VDSL Systems”; IEEE Communications Magazine; May 1999; pp. 73-78.
Kenneth J. Kerpez et al.; “The Error Performance of Digital Subscriber Lines in the Presence of Impulse Noise”; IEEE Transactions on Communications; vol. 43, No. 5; May 1995; pp. 1902-1905.
Jean-Jacques Werner; “The HDSL Environment”; IEEE J. on Selected Areas in Communications; vol. 9, No. 6; Aug. 1991; pp. 785-800.
Jean-Jacques Werner; “Impulse Noise in the Loop Plant”; Communications 1990; ICC-90 including Supercomm Technical Sessions, SUPPERCOMM/ICC '90, Conf. Record; IEEE Intl. Conf. on 1990; vol. 4; pp. 1734-1737.
Robi Polikar, The Wavelet Tutorial Part I; “Fundamental Concepts and an Overview of the Wavelet Theory, Second Edition”; Dept. of Electrical and Computer Engineering; Rowan University; May 31, 2002; 15 pages.
Network and Customer Installation Interfaces—Asymmetric Digital Subscriber Line (ADSL) Metallic Interface, ANSI T1.413-1998 Draft American National Standard for Telecommunications.

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