头盔式主动降噪耳机前馈降噪设计

针对头盔式主动降噪耳机设计过程中所面临的前馈控制器目标传递函数影响因素复杂,人工头声学测试不准确的问题,提出了基于真人佩戴测试数据设计前馈控制器的方法。分析了主动降噪耳机的原理,弥补了现有理论的不足,设计实验验证了噪声源方向、耳垫弹性、反馈控制器、绷带弹性、头盔、测试装置对前馈控制器目标传递函数的影响,给出了设计建议。基于真人佩戴测试数据设计了前馈控制器,并测试了其与反馈控制器配合时的混合降噪效果,其中真人佩戴时测试平均降噪量可达21.3 dB,人工头佩戴时仅有10.7 dB,证明了基于真人佩戴测试设计的耳机降噪效果更好,人工头佩戴不能很好的反应真人佩戴的情况。

Design of feedforward active noise control for helmet headset

Aiming at the problem of complex factors affecting the objective transfer function of the feedforward controller and the problem of incorrect acoustic test with head and torso simulator in the process of design helmet active noise control headset a method of designing feedforward controller based on human wearing test data is proposed. The principle of active noise control headset is analyzed, which makes up the deficiency of existing theories. Experiments are designed to verify the influence of noise source direction, ear pad elasticity, feedback controller, bandage elasticity, helmet and testing device on the target transfer function of the feedforward controller, some recommendations are proposed. The feedforward controller is designed based on the data of human wearing test, and the effect of hybrid active noise control is tested when it cooperates with the feedback controller. The noise reduction 21.3 dB when the human is wearing, but 10.7 dB when the head and torso simulator is wearing, which proves that the noise reduction effect of headset based on the human wearing test design is better, and the head and torso simulator wearing cannot reflect the human wearing situation very well.