Audio Enhancement in Compressed Domain Based on MPEG-AAC Codec

DENG Feng; BAO Feng; BAO Chang-chun

doi:10.3969/j.issn.0372-2112.2014.07.026

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Audio Enhancement in Compressed Domain Based on MPEG-AAC Codec

更新时间：2025-07-16

- Audio Enhancement in Compressed Domain Based on MPEG-AAC Codec
- Acta Electronica Sinica Vol. 42, Issue 7, Pages: 1410-1418(2014)
- 作者机构：
  
  北京工业大学电子信息与控制工程学院,北京,100124
- 作者简介：
- 基金信息：
  
  Key project of Science and Technology Development Plan of Beijing Municipality Education Commission (No.KZ201110005005);National Natural Science Foundation of China (No.61072089)
- DOI：10.3969/j.issn.0372-2112.2014.07.026
  CLC： TN912.3
- Published：2014
- 稿件说明：
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DENG Feng, BAO Feng, BAO Chang-chun. Audio Enhancement in Compressed Domain Based on MPEG-AAC Codec[J]. Acta Electronica Sinica, 2014, 42(7): 1410-1418.
DOI：

DENG Feng, BAO Feng, BAO Chang-chun. Audio Enhancement in Compressed Domain Based on MPEG-AAC Codec[J]. Acta Electronica Sinica, 2014, 42(7): 1410-1418. DOI： 10.3969/j.issn.0372-2112.2014.07.026.

摘要

本文基于MPEG-AAC音频编解码器，提出了一种压缩域的音频增强方法.首先，对含噪音频信号的比特流进行解码，得到含噪音频信号的MDCT系数；然后，利用修正的加权递归平均（Modified Weighted Recursive Averaging，MWRA）方法估计噪声功率；再者，利用基于听觉掩蔽原理的自适应

-阶双曲余弦（COSH）统计模型，对含噪音频的MDCT系数进行增强处理；最后，将增强后的MDCT系数重新量化编码，得到用于解码的增强比特流实验结果表明，本文提出的方法能有效去除AAC解码音频信号中的多种背景噪声，其性能明显优于参考方法.

Abstract

An audio enhancement method based on MPEG-AAC codec in compressed domain is proposed.First

the bit-stream derived from noisy audio signal is decoded to obtain MDCT coefficients of noisy audio signals.Then

the noise power is estimated by modified weighted recursive averaging (MWRA).Next

the adaptive -order COSH statistic modal method is employed to enhance MDCT coefficients.Finally

the enhanced MDCT coefficients are re-quantized to obtain an enhanced bit-stream which is used to get the enhanced audio signals by AAC decoder.The test results indicate that the proposed algorithm can effectively remove the noises derived from AAC bit-stream of audio signals and obviously outperforms the reference noise reduction methods.

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