Multiplex communications – Wide area network – Packet switching
Patent
1987-12-30
1990-01-02
Ng, Jin F.
Multiplex communications
Wide area network
Packet switching
379410, H04B 323
Patent
active
048918016
ABSTRACT:
A terminal is provided for transmitting data over a bidirectional analog channel with echo cncellation coupled to the reception timing, wherein, between an emission circuit and a reception circuit coupled to a bidirectional line by a hybrid coupler, an echo canceller synthesizes an estimated echo from samples of an analog emitted signal, sampled at the same frequency as the received signal, the sampling frequency being controlled by the reception circuit, which is not synchronous with the emission circuit. Such a terminal requires no interpolation filter at the input of the reception circuit and makes possible optimum coupling of the echo canceller with an equalizer.
REFERENCES:
patent: 4074086 (1978-02-01), Falconer et al.
patent: 4370741 (1983-01-01), Haass
patent: 4527020 (1985-07-01), Ito
patent: 4531220 (1985-07-01), Brie et al.
patent: 4539675 (1985-09-01), Fisher
Hespelt et al, "Ein verbesserter Echoloscher fur die Duplex-Datenubertragung uber 2-Draht-Verbindungen", Mar., 1983.
Peuch, "Sematrans 4848 un modem fonctionnant en duplex sur deux fils A 4800 bit/s", Communication et Transmission, Jun., 1984, France.
Falconer et al., "Echo Cancellation Techniques for Full-Duplex Data Transmission on Two Wire Lines", Nov. 1976, National Telephone Conference, Dallas, Tex., pp. 8.3-1 to 8.3-7.
Macchi Odile M. M.
Marcos Sylvie L.
Pintaux Jean-Bernard L. P.
Ng Jin F.
S.A.T. (Societe Anonyme de Telecommunications)
Vaas Randall S.
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