基于Volterra级数预测的音频频带扩展

电子学报 ›› 2012, Vol. 40 ›› Issue (12): 2501-2506.

基于Volterra级数预测的音频频带扩展

张兴涛, 鲍长春, 刘鑫, 张丽燕

北京工业大学电子信息与控制工程学院,北京 100124

收稿日期:2010-11-03 修回日期:2012-09-06 出版日期:2012-12-25 发布日期:2012-12-25
作者简介:张兴涛 女,1986年10月出生于河北保定.2009年进入北京工业大学攻读硕士学位.主要研究方向:音频频带扩展. E-mail:taozi@emails.bjut.edu.cn 鲍长春 男,1965年出生于内蒙古赤峰市,博士,教授,博士生导师,主要研究领域为语音与音频信号处理. E-mail:chchbao@bjut.edu.cn
基金资助:
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.ykj-2012-7001)

Audio Bandwidth Extension Based on Volterra Series

ZHANG Xing-tao, BAO Chang-chun, LIU Xin, ZHANG Li-yan

School of Electronic Information and Control Engineering,Beijing University of Technology,Beijing 100124,China

Received:2010-11-03 Revised:2012-09-06 Online:2012-12-25 Published:2012-12-25

摘要/Abstract

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.

关键词: 频带扩展, Volterra级数, 高斯混合模型, 码本映射

Abstract: 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 spectrum envelope 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 proposed algorithm,the super-wideband audio quality is improved at 24 kbps.

Key words: bandwidth extension, Volterra series, Gaussian mixture model, codebook mapping

中图分类号:

TN912.3

张兴涛, 鲍长春, 刘鑫, 张丽燕. 基于Volterra级数预测的音频频带扩展[J]. 电子学报, 2012, 40(12): 2501-2506.

ZHANG Xing-tao, BAO Chang-chun, LIU Xin, ZHANG Li-yan. Audio Bandwidth Extension Based on Volterra Series[J]. Acta Electronica Sinica, 2012, 40(12): 2501-2506.

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