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计算机工程

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基于空间位置信息的三维音频编码技术研究

廖传奇,涂卫平   

  1. (武汉大学 国家多媒体软件工程技术研究中心,武汉 430072)
  • 收稿日期:2016-01-11 出版日期:2017-01-15 发布日期:2017-01-13
  • 作者简介:廖传奇(1990—),男,硕士研究生,主研方向为音频信号处理与编码;涂卫平,副教授、博士。
  • 基金资助:
    国家自然科学基金青年基金“三维声场中声源水平定位线索感知特性测量与分析”(61201340);国家“863”计划项目(2015AA016306);国家自然科学基金重点项目(61231015)。

Research on 3D Audio Encoding Technology Based on Spatial Location Information

LIAO Chuanqi,TU Weiping   

  1. (National Engineering Research Center for Multimedia Software,Wuhan University,Wuhan 430072,China)
  • Received:2016-01-11 Online:2017-01-15 Published:2017-01-13

摘要: 现有的空间方位量化格点算法大多以全部声道为基础合成虚拟声源,违背了矢量幅度平移(VBAP)用3个声道形成一个虚拟声源的基本原理。此外未考虑各个声道之间的时间差,会造成音质下降。针对上述问题,设计基于VBAP基本原理的三维音频编解码框架,以3个声道为一组合成虚拟声源及下混信号,编码时增添时间差参数,在解码端提出基于线性方程组求解的虚拟声像重分配方法,获得与原始声道配置一致的重建信号。实验结果表明,该方法生成的三维音频信号,利用MUSHRA标准进行主观测试,平均得分比现有方法高出12分。

关键词: 三维音频, SLQP算法, 矢量幅度平移, 虚拟声源, 时间差, 下混信号

Abstract: The existing Spatial Localization Quantization Point(SLQP) algorithm synthesizes virtual sound sources based on all sound tracks,which violates the Vector Based Amplitude Panning(VBAP) basic principle of forming a virtual sound source with three sound tracks.Besides,the sound quality declines for not considering time differences between each track.Aiming at these problems,the paper designs a 3D audio codec framework based on VBAP basic principles with three sound tracks in a group to synthesize virtual sound sources and mixed signals.During decoding,time difference parameter is added and the virtual audio-visual reallocation method based on solution of linear equations is put forward,gaining a reconstructed signal consistent with original sound track in configuration.Experimental result shows that the 3D audio signal generated by this way applies MUSHRA standard to subjective tests,its scores have an average of 12 points higher than existing methods.

Key words: 3D audio, Spatial Localization Quantization Point(SLQP) algorithm, Vector Based Amplitude Panning(VBAP), virtual sound sources, time difference, mixed signal

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