基于线性扬声器阵列的鲁棒性串扰消除系统研究

发布时间：2018-01-22 20:41

本文关键词： 串扰消除鲁棒性线性扬声器阵列声重放双耳时间差　出处：《南京大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着大屏幕电视和3D显示技术的不断普及,人们对相应的声重放系统的要求不断提高。基于扬声器阵列的声重放系统由于可以通过优化多声源重放信号获得更好的听音体验,日益受到研究者的关注。各种类型的扬声器阵列中,线性阵列由于其实现简单,易于和大屏幕系统结合,成为了目前学术研究和工程应用的热点。基于阵列的立体声重放系统无法避免的一个关键问题就是扬声器的串扰问题,即原始信号中的同侧通道信号会传播到异侧人耳中,导致同侧与异侧通道信号相互干扰,破坏了原始信号中隐含的声源方位感与立体感。串扰消除系统是解决这一问题的关键,可靠的串扰消除系统需要充分考虑扬声器单元的位置、扬声器重放信号的频带范围、系统的重放效果(隔离度)以及系统的动态范围等因素。本文对基于线性扬声器阵列的串扰消除系统展开研究,重点对最佳声源分布和多控制点策略在线阵列中的结合进行分析。本文介绍了串扰消除系统的一般设计方法,并讨论了最佳声源分布技术的基本特点。考虑到最佳声源分布技术理论上只适用于环状阵列,不利于实际应用。所以,我们提出了从环状阵列映射为线性阵列的方法,并给出了相应的声源分布设定以及频带范围划分的准则,在减少系统动态范围损失的基础上保证了线阵列在最佳听音点的声重放性能。在第一部分工作基础上,为进一步提升系统的鲁棒性,减弱回放系统对人头偏移的敏感度,我们将多控制点策略与最佳声源分布技术结合,在原有人头双耳作为优化点的基础上,增加多个优化点于人头两侧,有效提高了系统的鲁棒性,扩大了听音区域。同时,重放系统也保持了最佳声源分布技术的优势,即有较出色的低频重放效果。考虑到线阵列的服务对象往往不止一个听音者,论文还在基于双刚性球散射理论的重放系统模型上,分析了自由场模型和刚性球模型之间的关系,以及两听音者人头间距对系统重放的影响,提出了针对双听音者的鲁棒性串扰消除方法,并通过仿真计算验证了此鲁棒性串扰消除系统的有效性。
[Abstract]:With the popularization of large-screen TV and 3D display technology. The sound playback system based on loudspeaker array can get a better listening experience by optimizing multi-source playback signal. Among the various types of loudspeaker arrays, linear arrays are easy to combine with large screen systems because of their simple implementation. It has become a hot topic in academic research and engineering application. The crosstalk problem of loudspeaker is one of the key problems that can not be avoided in stereo playback system based on array. That is, the same side channel signal in the original signal will propagate to the foreign ear, resulting in the interference between the same side channel signal and the other side channel signal. The crosstalk cancellation system is the key to solve this problem. The reliable crosstalk cancellation system needs to fully consider the location of the speaker unit. The frequency band range of loudspeaker playback signal, the effect of playback (isolation) and the dynamic range of the system, etc. In this paper, the crosstalk cancellation system based on linear loudspeaker array is studied. The combination of optimal sound source distribution and multi-control point strategy online array is analyzed. The general design method of crosstalk cancellation system is introduced in this paper. The basic characteristics of the optimal sound source distribution technology are discussed. Considering that the optimal sound source distribution technology is only applicable to the ring array in theory, it is not good for practical application. We propose a method of mapping from a ring array to a linear array, and give the corresponding criteria for setting the distribution of sound sources and dividing the frequency band range. On the basis of reducing the dynamic range loss of the system, the sound replay performance of the linear array at the optimal listening point is guaranteed. On the basis of the first part, the robustness of the system is further improved. To reduce the sensitivity of the playback system to the head shift, we combine the multi-control point strategy with the optimal sound source distribution technology, and add multiple optimization points on both sides of the head on the basis of the original head and ears as the optimization point. It can effectively improve the robustness of the system and enlarge the listening area. At the same time, the replay system also maintains the advantage of the optimal sound source distribution technology. That is to say, there is an excellent low frequency playback effect. Considering that the target of linear array is often more than one listener, the paper is still on the replay system model based on the double rigid sphere scattering theory. The relationship between the free field model and the rigid sphere model, and the effect of the headspace between the two speakers on the playback of the system are analyzed, and a robust crosstalk cancellation method for the dual listener is proposed. The effectiveness of the robust crosstalk cancellation system is verified by simulation.
【学位授予单位】：南京大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN643

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