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电子学报  2012 

基于Volterra级数预测的音频频带扩展

, PP. 2501-2506

Keywords: 频带扩展,Volterra级数,高斯混合模型,码本映射

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Abstract:

本文采用非线性分析方法,基于Volterra级数提出了一种宽带音频信号的频带扩展方法,并利用高斯混合模型(GaussianMixtureModel,GMM)和码本映射技术对扩展后的音频信号进行了谱包络和能量增益调整.实验表明,所提算法的性能要好于已有的非线性频带扩展算法,当用本文的方法替代ITU-TG.722.1C编码器中的噪声填充技术时,在24kbps得到了提升的超宽带音频质量.

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