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.
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.
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.