Patent
1975-11-28
1978-05-02
Claffy, Kathleen H.
H04B 324
Patent
active
040876543
ABSTRACT:
An adaptive echo canceller for digital data transmission systems permits full duplex, i.e., simultaneous bidirectional transmission, operation at full bandwidth over two-wire transmission facilities. A transversal filter arrangement digitally synthesizes a cancellation signal for unwanted leakage, i.e., echoes, through hybrid junctions directly from the digital data input symbols, rather than from the analog transmitter output. An error control signal for correlation with tap signals on the transversal filter is derived from the output of the receiver, instead of its input.
REFERENCES:
patent: RE27250 (1971-12-01), Lucky
patent: 3499999 (1970-03-01), Sondhi
patent: 3500000 (1970-03-01), Kelly et al.
patent: 3597541 (1971-08-01), Proakis et al.
patent: 3732410 (1973-05-01), Mackechnie
patent: 3922505 (1975-11-01), Hoge
patent: 4007341 (1977-02-01), Sourgens et al.
Koll and Weinstein; "Simultaneous Two-Way Data Transmission Over a Two-Wire Circuit"; I.E.E.E. Transactions on Communications, vol. Com-21, No. 2; Feb. 1973; pp. 143-147.
"Application of Automatic Transversal Filters to the Problem of Echo Suppression"; Bell System Technical Journal; vol. 45, No. 2; Dec. 1966; pp. 1847-1851.
"An Adaptive Echo Canceller"; Bell System Technical Journal; Mar. 1967; vol. 46, No. 3; pp. 497-511.
Bell Telephone Laboratories Incorporated
Claffy Kathleen H.
Kearns, Jr Joseph P.
Myers Randall P.
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