基于压电结构的有源耳罩研究

目前有源耳罩大都采用固定的模拟反馈控制器，不能够最大限度地消除低频噪声。根据内模型系统原理，设计出基于内模型的自适应反馈控制器，使用数字方式针对周期性噪声进行控制。实验中采用压电陶瓷作为次级声源，使装置在体积与质量方面有显著改善。通过仿真和测试表明，该控制结构能有效消除噪声中所含的单周期噪声和双周期噪声。当耳罩内容积发生较大变化后，仍能保持良好的降噪效果，具有较强的鲁棒性。

Research of Active Headset Using Piezoelectric Structure

Most of active headsets, which use fixed analog feedback controllers, are not able to maximize the noise reduction. In this paper according to the principle of Internal Model Control (IMC) system, adaptive feedback controller is designed based on IMC to reduce tonal noises with digital mode. In the experiments piezoelectric ceramic is used as the second noise resource, which can improve the equipment performance in volume and mass. By computer simulations and experimental tests, this control structure can reduce one and two tonal frequency noises. After the volume in headset has taken some obvious changes, it is still available and has very strong robustness.