Sub-band echo canceller using optimum wavelet packets and cross-

Details Sub-band echo canceller using optimum wavelet packets and cross- Sub-band echo canceller using optimum wavelet packets and cross-

1997-01-15

1999-08-10

Pham, Chi H.

Pulse or digital communications

Multilevel

379410, 370286, H04L 2534, H04M 100, H04B 320

Patent

active

059370092

ABSTRACT:
An echo canceller comprising a first wavelet decomposition block for decomposing a reference signal into a plurality of reference wavelet packets; a second wavelet decomposition block for decomposing an echo signal into a plurality of echo signal packets; an adaptive filter bank for receiving and filtering the reference wavelet packets and in response generating a plurality of filtered output packets replicating the echo signal packets; a plurality of subtracters for receiving and subtracting respective ones of the filtered output packets from the echo signal packets and in response generating and applying a plurality of error signals to the adaptive filter bank for modifying the transfer function of the adaptive filter bank; and a wavelet reconstruction block for receiving and reconstructing the error signals to form a residual signal from which the echo signal has been cancelled. Optimum wavelet filters for the best echo cancellation are provided, as are two wavelet echo cancellation structures.

REFERENCES:
patent: 4956838 (1990-09-01), Gilloire et al.
patent: 5272695 (1993-12-01), Makino et al.
patent: 5566167 (1996-10-01), Duttweiler
patent: 5659609 (1997-08-01), Koizumi et al.
patent: 5663955 (1997-09-01), Iyengar
Qu Jin et al., Optimum Filter Banks for Signal Decomposition and its Application in Adaptive Echo Cancellation IEEE Transactions on Signal Processing vol. 44, No. 7, pp. 1669-80. IEEE Jul. 1996, USA.

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