Transversal filter echo canceller

Details Transversal filter echo canceller Transversal filter echo canceller

1990-04-10

1992-01-28

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

379411, 36472416, H04B 323

Patent

active

050848666

ABSTRACT:
A transversal filter apparatus having a shift register, an averaging circuit for averaging data stored in sequential shift registers, and a multiplier for multiplying the averaged data. Additionally, a method and apparatus for echo cancelling a transhybrid response having a well behaved portion by using a transversal filter based echo canceller wherein the data stored in adjacent registers of the shift register which correspond to the well behaved portion of the transhybrid response are averaged together prior to being applied to a multiplier. This apparatus and method makes possible a reduction in the amount of hardware required to achieve a given level of echo cancellation.

REFERENCES:
patent: 3792356 (1974-02-01), Kobayashi et al.
patent: 4412341 (1983-10-01), Gersho et al.
patent: 4703447 (1987-10-01), Lake, Jr.
patent: 4760596 (1988-07-01), Agrawal et al.
patent: 4926472 (1990-05-01), Batruni et al.
IEEE Transactions on Communications, Sep., 1976, vol. COM-24, No. 9, pp. 956-962, Kurt H. Mueller, "A New Digital Echo Canceler for Two-Wire Full-Duplex Data Transmission".
IEEE Transactions on Circuits and Systems, Mar., 1987, vol. CAS-34, No. 3, pp. 225-232, Ernst G. Peter, "Multistage RAM: An FIR Filter for Echo Cancellation in a Digital Two-Wire Subscriber Loop".
IEEE Transactions on Communications, Nov., 1982, vol. COM-30, No. 11, pp. 2421-2433, O. Agazzi, D. Messerschmitt, & D. Hodges, "Nonlinear Echo Cancellation of Data Signals".
IEEE Journal on Selected Areas in Communications, Mar., 1984, vol. SAC-2, No. 2, pp. 314-323, P. Van Gerwen, "Design Considerations for a 144 kbit/s Digital Transmission Unit for the Local Telephone Network".

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