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Primary Examiner: Claffy, Kathleen H.
Assistant Examiner: Myers, Randall P.
Attorney: Kearns; Joseph P.

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Title: Echo cancellation in two-wire, two-way data transmission systems

Abstract: An adaptive echo canceller for two-wire, simultaneous two-way data communication at full bandwidth uses Nyquist-interval, rather than baud-interval, processing to achieve independence from timing discrepancies between near-end and far-end terminals. The entire echo signal, and not merely baud-interval samples thereof, is suppressed. The echo canceller is preferably a transversal structure.

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Inventors: Weinstein, Stephen B. (Holmdel, NJ, US)

Application Number: 880293
Filing Date: 1978-02-22
Publication_date: 1978-12-26
Assignee: Bell Telephone Laboratories, Incorporated (Murray Hill, NJ)
Primary Class(es): 379/406.06 370/276, 370/286, 370/291
Other Classes:
US Patent Ref:

3499999	Mar, 1970	Sondhi	179/170.
3500000	Mar, 1970	Kelly et al.	179/170.
3597541	Aug, 1971	Proakis et al.	179/170.
3732410	May, 1973	Mackechnie	179/170.
3735055	May, 1973	Thomas	179/170.
3922505	Nov, 1975	Hoge	179/170.
4007341	Feb, 1977	Sourgens et al.	179/170.

Other Refs: Other References: V. Koll and S. Weinstein; "Simultaneous Two-Way Data Transmission over a Two-Wire Circuit"; IEEE Transactions on Communications; Feb. 1973; pp. 143-147.
M. Sondhi; "An Adaptive Echo Canceller"; Bell System Technical Journal; vol. XLVI, No. 3; Mar. 1967; pp. 497-511.
F. Becker and H. Rudin; "Application of Automatic Transversal Filters to the Problem of Echo Suppression"; Bell System Tech. Journal; Dec. 1966; pp. 1847-1850.