Joint filterbanks for echo cancellation and audio coding

P. Eneroth
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引用次数: 11

Abstract

Joint structures for audio coding and echo cancellation are investigated, utilizing standard audio coders. Two types of audio coders are considered, coders based on cosine modulated filterbanks and coders based on the modified discrete cosine transform (MDCT). For the first coder type, two methods for combining such a coder with a subband echo canceller are proposed. The two methods are: a modified audio coder filterbank that is suitable for echo cancellation but still generates the same final decomposition as the standard audio coder filterbank, and another that converts subband signals between an audio coder filterbank and a filterbank designed for echo cancellation. For the MDCT based audio coder, a joint structure with a frequency-domain adaptive filter based echo canceller is considered. Computational complexity and transmission delay for the different coder/echo canceller combinations are presented. Convergence properties of the proposed echo canceller structures are shown using simulations with real-life recorded speech.
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联合滤波器组回声消除和音频编码
利用标准音频编码器,研究了音频编码和回波消除的联合结构。考虑了两种类型的音频编码器,基于余弦调制滤波器组的编码器和基于改进离散余弦变换(MDCT)的编码器。对于第一种编码器类型,提出了两种将这种编码器与子带回波消除器相结合的方法。这两种方法是:一种改进的音频编码器滤波器组,它适用于回波消除,但仍然产生与标准音频编码器滤波器组相同的最终分解;另一种方法是在音频编码器滤波器组和设计用于回波消除的滤波器组之间转换子带信号。对于基于MDCT的音频编码器,考虑了一种与频域自适应滤波器相结合的结构。给出了不同编码器/回波消除器组合的计算复杂度和传输延迟。通过对真实语音记录的仿真显示了所提出的回声消除结构的收敛特性。
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