A Study of a bit allocation method for MPEG-2 A__-dvanced A__-udio C__-oding

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  • AACオーディオエンコーダの音質改善手法の検討(デジタル放送受信技術および一般)
  • AACオーディオエンコーダの音質改善手法の検討
  • AAC オーディオエンコーダ ノ オンシツ カイゼン シュホウ ノ ケントウ

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Abstract

This paper discusses about a bit allocation method for MPEG-2 Advanced Audio Coding (AAC). The AAC adopts 11 Huffman tables which have different sizes of large absolute values (LAV). We proposed to normalize the maximum DCT coefficient of a band be to the Huffman table's LAV. The bits saved for other DCT coefficients can be reallocated to other frame, which help in controlling the fluctuation in sound quality from frame to frame. Further on applying this bit-allocation method to the Mid/Side (L+R/L-R) stereo coding control method, stereo sound quality with high L/R channel correlation is made better. We confirmed these lead to an overall improvement in annoying distortion to the listener.

Journal

  • ITE Technical Report

    ITE Technical Report 26.52 (0), 5-8, 2002

    The Institute of Image Information and Television Engineers

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