Audio enhancement in compressed domain based on MPEG-AAC codec

被引：0
作者：
机构：
[1] School of Electronic Information and Control Engineering, Beijing University of Technology, Beijing
来源：
Deng, Feng | 1600年 / Chinese Institute of Electronics卷 / 42期
关键词：
AAC bit-stream; Audio enhancement; Compressed domain; COSH estimator; MWRA noise estimation;
D O I：
10.3969/j.issn.0372-2112.2014.07.026
中图分类号：
学科分类号：
摘要：
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 β-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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页码：1410 / 1418
页数：8
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