参量声源非线性声场分形特征及形态控制方法研究

项目名称： 参量声源非线性声场分形特征及形态控制方法研究

项目编号： No.61301261

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 无线电电子学、电信技术

项目作者： 李学生

作者单位： 电子科技大学

项目金额： 24万元

中文摘要： 参量声源是一种利用声波在空气中的非线性交互效应工作的新型声源，其声场具有高度的指向性和强烈的非线性特征，目前尚没有精确的声场理论模型来表达其特性。为此，项目拟以参量声源为研究对象,对其非线性声场的分形特征和形态控制方法展开研究，研究内容主要包括：运用分形学理论分析声场在分形几何空间的形态特征，以揭示声场的形成机理和影响机制；采用盒子计数、功率谱、小波变换、多重分形等方法确定声场的分形维数，以建立基于分形维数的非线性声场理论模型；在理论模型基础上明确声场的形态控制方法，进而开发出新型非线性信号处理算法模型及实现方法；最后通过声场测试和实验验证评估所建理论模型的准确性和有效性。项目的研究成果可为参量声源提供更加完善的精确理论依据,对于推动参量声源的规模化应用进程具有重要意义。

中文关键词： 参量声源；分形特征；声频定向扬声器；非线性声场；形态控制

英文摘要： Parametric sound source is a novel sound source which utilizes the nonlinear interactive effect in the process of sound propagation in the air. It can emit a sound field with high directivity and strong nonlinear characteristics which can not be described accurately with current theoretical models. Therefore, the project will be focused on the nonlinear sound field of parametric sound source and explored from the following aspects. Firstly, based on fractal theory, the fractal characteristics of the nolinear sound field will be studied to illustrate the forming and infulencing mechanism of the nonlinear sound field. Secondly, in order to build a fractal-based model, the fractal dimension will be analyzed by applying box-counting method, power spectrum method, wavelet transform method, multi-fractal method, etc. Thirdly, based on the above established model, the morphology control methods will be developed and the nonlinear signal processing algorithm models will be designed and realized. At last, the accuracy and validity of the established theoretical model will be estimated via experiments. This project will provide a more advanced accurate theoretical basis and promote the process of large-scale industrial applications for parametric sound source.

英文关键词： Parametric Sound Source；Fractal Characteristics；Audio Directional Loudspeaker；Nonlineare Sound Field；Morphology control