MPEG-4 AAC感知噪声替代算法的研究与改进

doi:10.13190/jbupt.201202.15.119

北京邮电大学学报 ›› 2012, Vol. 35 ›› Issue (2): 15-18.doi: 10.13190/jbupt.201202.15.119

MPEG-4 AAC感知噪声替代算法的研究与改进

解文华¹,易本顺¹,肖进胜¹,黄正旭¹,赵继勇²

1武汉大学电子信息学院, 武汉 430079; 2 解放军理工大学通信工程学院, 南京 210007

收稿日期:2011-05-25 修回日期:2011-10-23 出版日期:2012-04-28 发布日期:2012-01-05
通讯作者: 肖进胜 E-mail:js_xiao@sina.com
作者简介:解文华（1987-），男，博士生肖进胜（1975-），男，副教授，E-mail：js_xiao@tom.com
基金资助:
国家自然科学基金项目（41001306）；湖北省自然科学基金项目（2009cdb328）

The Research and Improvement of Perceptual Noise Substitution Algorithm in MPEG-4 AAC

XIE Wen-hua¹,YI Ben-shun¹,XIAO Jin-sheng¹,HUANG Zheng-xu¹,ZHAO Ji-yong²

1 School of Electronic Information, Wuhan University, Wuhan 430079, China;2 Institute of Communication Engineering, People’s Liberation Army University of Science and Technology, Nanjing 210007, China

Received:2011-05-25 Revised:2011-10-23 Online:2012-04-28 Published:2012-01-05
Contact: Jin-Sheng XIAO E-mail:js_xiao@sina.com

摘要/Abstract

摘要：

针对先进音频编码(AAC)中感知噪声替代(PNS)标准算法在对噪声进行检测时容易造成误判而导致编码音质恶化的问题，提出了一种新的噪声检测算法．该算法利用了噪声频谱比音调频谱更为平坦的特性，设置了帧和比例因子带的双重门限，以对噪声进行精确检测．另外，在PNS模块中加入了预编码模块以进一步提高PNS的编码效率．实验结果表明，与标准算法相比，该算法大大提高了噪声的检测精度，在不增加编码复杂度的同时获得了更高的编码效率．

关键词: 内置天线；多频段;音频信号, 先进音频编码, 感知噪声替代, 噪声检测

Abstract:

When using ISO standard of perceptual noise substitution (PNS) algorithm in advanced audio coding(AAC), it seems to cause misjudgment when detecting the noise, and results in quality deterioration of coded audio. A new noise detection algorithm is proposed to solve the problem. It employs the characteristic of noise spectrum that is more flat than tone spectrum, and sets the dual threshold for the frames and scaling factor bands to detect the noise accurately. In addition, precoding module is added into the PNS module to further improve the coding efficiency of PNS. Experiments show that, compared with standard algorithm, the proposed greatly did improve the accuracy of noise detection, and obtain higher coding efficiency without any increase in coding complexity.

Key words: internal antenna, multi;audio signal, advanced audio coding, perceptual noise substitution, noise detection

中图分类号:

TN911

解文华易本顺肖进胜黄正旭赵继勇. MPEG-4 AAC感知噪声替代算法的研究与改进[J]. 北京邮电大学学报, 2012, 35(2): 15-18.

[1]	宫霄霖，毛瑞全. 结合PCNN和局部维纳滤波的图像去噪[J]. 北京邮电大学学报, 2011, 34(5): 67-70.
[2]	王建勇,周晓光,廖启征. 基于2级检测的脉冲噪声滤除算法[J]. 北京邮电大学学报, 2005, 28(3): 59-61.

MPEG-4 AAC感知噪声替代算法的研究与改进

The Research and Improvement of Perceptual Noise Substitution Algorithm in MPEG-4 AAC

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