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KMID : 0917520040110040089
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Journal of Speech Sciences
2004 Volume.11 No. 4 p.89 ~ p.97
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Performance Improvement of the Network Echo Canceller
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Yoo Jae-Ha
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Abstract
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In this paper, an improved network echo canceller is proposed. The proposed echo canceller is based on the LTJ(lattice transversal joint) adaptive filter which uses informations from the speech decoder. In the proposed implementation method of the network echo canceller, the filer coefficients of the transversal filter part in the LTJ adaptive filter is updated every other sample instead of every sample. So its complexity can be lower than that of the transversal filter. And the echo cancellation rate can be improved by residual echo cancellation using the lattice predictor whose order is less than 10. Computational complexity of the proposed echo canceller is lower than that of the transversal filter but the convergence speed is faster than that of the transversal filter. The performance improvement of the proposed echo canceller was verified by the experiments using the real speech signal and speech coder.
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KEYWORD
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network echo canceller, adaptive filter, residual echo cancellation, lattice predictor
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