【摘要】 采用IMC控制器结构,设计自适应数字滤波器消除耳罩内的噪声。次级声源采用压电陶瓷驱动,可有效减轻耳罩体积和重量。针对对象变化和反馈控制器特点,研究了如何加强系统的鲁棒性。实验及仿真结果表明,加强鲁棒性后算法对较高频率噪声信号及对象变化较大的情况有一定效果。更多还原

【Abstract】 Our design uses an adaptive digital filter with IMC arrangement to optimally cancel unwanted acoustic noise in the headset. Piezoelectric ceramic is used as a second noise source to reduce the volume and mass of the headset. In the light of the change of object and the property of adaptive feedback noise control, the robustness of the system is also explored. Experiments and simulations show that the modified algorithm is effective in the situation where major frequencies of noise are relatively high or the object changes significantly.更多还原