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KMID : 0917520040110020227
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Journal of Speech Sciences
2004 Volume.11 No. 2 p.227 ~ p.235
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A Practical Implementation of the LTJ Adaptive Filter and Its Application to the Adaptive Echo Canceller
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Yoo Jae-Ha
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Abstract
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In this paper, we proposed a new practical implementation method of the lattice transversal joint (LTJ) adaptive filter using speech codec’s information. And it was applied to the adaptive echo cancellation problem to verify the efficiency of the proposed method. Realtime implementation of the LTJ adaptive filter is very difficult due to high computational complexity for the filter coefficients compensation. However, in case of using speech codec, complexity can be reduced since linear predictive coding (LPC) coefficients are updated each frame or sub-frame instead of every sample. Furthermore, LPC coefficients can be acquired from speech decoder and transformed to the reflection coefficients. Therefore, the computational complexity for updates of the reflection coefficients can be reduced. The effectiveness of the proposed LTJ adaptive filter was verified by the experiments about convergence and tracking performance of the adaptive echo canceller.
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KEYWORD
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adaptive filter, practical implementation, speech codec, reflection coefficient
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