High performance echo canceller for high speed modem

Details High performance echo canceller for high speed modem High performance echo canceller for high speed modem

1996-10-28

1998-08-04

Zele, Krista

Telephonic communications

Echo cancellation or suppression

379399, 379410, 379411, 370290, 36472401, H04M 900

Patent

active

057906580

ABSTRACT:
An architecture for echo cancellation in communication networks is provided that uses a multi-stage adaptation algorithm which operates on echo cancellation filters of different configurations. When each of the configurations exhibit increased sensitivity to a different adaptation parameters, the resulting architecture gains an increased estimation accuracy. The increased accuracy readily translates into improved echo cancellation performances. In one embodiment, the architecture includes a baseband filter configuration and a passband filter configuration for echo cancellation. The increased adaptation sensitivity of the baseband filter configuration allows a more accurate estimate of the frequency offset. This estimate may then used by the passband filter configuration to attain a better echo cancellation performance.

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Werner, Jean-Jacques, "An Echo-Cancellation-Based 4800 Bit/s Full-Duplex DDD Modem," IEEE Journal on Selected Areas in Communications, vol. SAC-2, No. 5, Sep. 1984, pp. 722-730.

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