Multiplex communications – Wide area network – Packet switching
Patent
1990-05-24
1993-09-28
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
379410, 375 17, H04B 323, H04L 2534
Patent
active
052491790
ABSTRACT:
An echo canceller system includes a code converting circuit for converting binary serial data into two-bit units to generate a two-bit converter code. The bits of the converted code are added after each is amplified to a predetermined level, and the result of the addition is subjected to a DC offset circuit to generate a 2B1Q code. Part of the 2B1Q code, which is transmitted via a 2-wire transmission path, returns to the receiving side of the canceller system as an echo signal. The echo signal is canceled by at least one echo canceller, which can include an adaptive filter network and a subtracter unit.
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Hsu Alpus H.
NEC Corporation
Olms Douglas W.
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