Echo canceller with adaptive and non-adaptive filters

Telephonic communications – Subscriber line or transmission line interface – Network interface device

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Details

379406, 379407, 379411, H04M 908, H04B 323

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active

056640110

ABSTRACT:
An echo canceller includes receive and send paths each having an input and output port, a first non-adaptive filter with first filter coefficients for generating a first replica signal in response to a receive input signal, a second adaptive filter with second filter coefficients for generating a second replica signal in response to the receive input signal, a first subtracter for generating a send output signal representing a difference between a send input signal and the first replica signal, a second subtracter for generating an error signal representing a difference between the send output signal and the second replica signal, and a controller for replacing the first filter coefficients by the sum of the first and second filter coefficients and for resetting the second filter coefficients in response to a calculation that includes a first quantity associated with the send output signal and a second quantity associated with the error signal.

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Ochiai et al, "Echo Canceler with Two Echo Path Models" IEEE Transactions On Communications, vol. COM-25, No. 6, Jun. 1977, pp. 589-595.
Messerschmitt, "Echo Cancellation in Speech and Data Transmission",IEEE Journal on Selected Areas in Communications, vol. SAC-2, No. 2, Mar. 1984, pp. 283-298.
Tao et al, "A Cascadable VLSI Echo Canceller", IEEE Journal on Selected Areas in Communications, vol. SAC-2, No. 2, Mar. 1984, pp. 298-303.

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