摘要
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(Gaussian Mixture Model,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-T G.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.
In this paper,a bandwidth extension algorithm of wideband audio signal is proposed based on Volterra series with the nonlinear analysis method. The Gaussian mixture model and codebook mapping algorithms are used to adjust the specmtm enve- lope and energy gain of the extended audio signal separately.Test results indicate that the proposed method outperforms the existing nonlinear algorithms. When the noise-filling method used in ITU-T G. 722.1C super-wideband audio codec is replaced by the pro- posed algorithm,the super-wideband audio quality is improved at 24 kbps.
出处
《电子学报》
EI
CAS
CSCD
北大核心
2012年第12期2501-2506,共6页
Acta Electronica Sinica
基金
国家自然科学基金(No.61072089
No.60872027)
北京市自然科学基金(No.4082006)
北京市属高等学校人才强教计划资助
北京工业大学第十届研究生科技基金(No.yk-j 2012-7001)
