基于音调调整的AVS-P10带宽扩展优化方案  

Optimized Bandwidth Extension Scheme of AVS-P10 Based on Tonality Adjustment

作　　者：袁凤强 王晓晨[1,2] 王中元[1,2] 陈丹 姜林[1,3] YUAN Fengqiang;WANG Xiaochen;WANG Zhongyuan;CHEN Dan;JIANG Lin(National Engineering Research Center of Multimedia Software,Wuhan University,Wuhan 430072,China;Computer School,Wuhan University,Wuhan 430072,China;Software College,East China Institude of Technology,Nanchang 330013,China)

机构地区：[1]武汉大学国家多媒体软件工程技术研究中心,武汉430072 [2]武汉大学计算机学院,武汉430072 [3]东华理工大学软件学院,南昌330013

出　　处：《计算机工程》2018年第10期286-291,共6页Computer Engineering

基　　金：国家自然科学基金(61762005);江西省教育厅科技项目(GJJ150585)

摘　　要：AVS-P10是低码率带宽扩展方案的国家标准,但其仅利用高频包络信息和高频增益调整还原信号的高频部分,导致还原音质较差。为此,在研究AVS-P10带宽扩展原理的基础上,提出一种基于音调调整的带宽扩展优化方案。在编码端通过快速傅里叶变换域提取音调参数,在解码端根据音调参数对高频陡峭的峰和谷做精细调整,使重建后的谱包络结构更接近原始语音。实验结果表明,该方案在重建音质上相较于原AVS-P10标准,客观评价指标ODG得分提高9. 4%,主观评价指标CMOS得分提高1. 14分,还原音质有明显改善。AVS-P10 is a national standard for low bit rate bandwidth extension schemes,but since the standard only uses the high frequency envelope information and the high frequency gain to adjust the high frequency portion of the restored signal,the restored sound quality is poorer.Aiming at this problem,after analyzing the corresponding bandwidth extension principle of AVS-P10,a novel bandwidth extension scheme based on tonality adjustment is proposed.Tonality parameters are extracted from the encoder part in Fast Fourier Transform(FFT)domain,which are recovered to adjust the steep peaks and dips in decoder.Experimental results show that,compared with AVS-P10 standard,the proposed scheme can improve the ODG score by 9.4%with the objective judgement test,and the CMOS score by 1.14 with the subjective test part,which concludes that the reconstructed audio quality is improved.

关 键 词：移动音频 AVS-P10标准 快速傅里叶变换 带宽扩展 音调调整 

分 类 号：TP37[自动化与计算机技术—计算机系统结构]