超薄屏幕定向扬声器理论及关键技术研究

The technology of screen directed sound transmission based on acoustic parametric array is a new technology and future development direction that may bring about revolutionary changes in multimedia audio-visual equipment. We take advantage of this through an electrostatic film ultrasonic transducer embedded in the screen that create complex waveforms such that the nonlinearly created difference tones in the air reconstruct into the desired audio signal. This generates a highly directional sound beam. In this project, the theory and key technology of the electrostatic thin film ultrasonic transducer based on the acoustic parametric array are developed. The main contents include: (1) Establishing the theoretical model of the transducer aims to reveal the mechanism of the directional sound and solve the design method of the transducer. (2) Modeling the acoustic field of screen directional loudspeaker is to focus on the influence mechanism and rule of transducer on the nonlinear acoustic propagation of acoustic parametric array, and a set of mature screen directional loudspeaker acoustic field control method is formed. (3) The theory and realization method of nonlinear acoustic signal control and processing are studied to solve the strong nonlinear problem of the screen oriented loudspeaker. (4) Setting up an experimental test platform to verify the directional sound effect of the principle prototype. The study will lay the theoretical and practical engineering basis for developing the acoustic parametric array based for ultra-thin screen directed sound.

基于声参量阵的屏幕定向发声技术是一种可能带来多媒体视听设备发生革命性变革的新技术和未来发展方向。它通过内嵌在屏幕中的静电薄膜超声换能器，振动空气分子产生出不同音调重建成所需的音频信号，进而产生一个具有高度指向性的声束，实现声音的定向传播。本项目拟开展基于声参量阵的静电薄膜超声换能器理论及关键技术研究，主要研究内容为：（1）建立换能器理论模型，揭示其定向发声机理，提出换能器设计方法；（2）建立屏幕定向扬声器的声场理论模型，揭示换能器对声参量阵非线性声波传播的影响机理和规律，提出屏幕定向扬声器声场控制方法；（3）研究非线性声信号控制及处理理论和实现方法，解决屏幕定向扬声器存在的强非线性问题；（4）研制原理样机，开展实验研究，验证和评估原理样机的定向发声效果。本项目研究成果可为基于声参量阵的超薄屏幕定向发声新技术奠定必要的理论基础和为工程化提供关键技术。

基于声参量阵的屏幕定向发声技术是一种可能带来多媒体视听设备发生革命性变革的新技术和未来发展方向。它通过内嵌在屏幕中的静电薄膜超声换能器，振动空气分子产生出不同音调重建成所需的音频信号，进而产生一个具有高度指向性的声束，实现声音的定向传播。本项目拟开展基于声参量阵的静电薄膜超声换能器理论及关键技术研究，主要研究内容为：（1）建立换能器理论模型，揭示其定向发声机理，提出换能器设计方法；（2）建立屏幕定向扬声器的声场理论模型，揭示换能器对声参量阵非线性声波传播的影响机理和规律，提出屏幕定向扬声器声场控制方法；（3）研究非线性声信号控制及处理理论和实现方法，解决屏幕定向扬声器存在的强非线性问题；（4）研制原理样机，开展实验研究，验证和评估原理样机的定向发声效果。本项目研究成果可为基于声参量阵的超薄屏幕定向发声新技术奠定必要的理论基础和为工程化提供关键技术。