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考察了虚拟传声器应用于有源抗噪声护听器的稳定性和降噪性能。理论上分析了虚拟传声器算法的稳定性,并通过引入反馈控制器和设计次级通道模型使得算法在不同护听器佩戴方式下都保持稳定,获得高噪声衰减和高稳定性。实验结果证实了虚拟传声器的应用可以在耳道口获得更高的窄带噪声衰减,而且所采取的措施可以保证护听器在不同佩戴状态下都能稳定。
The stability and noise reduction performance of virtual microphones applied to active anti-noise hearing aids are investigated. The stability of the virtual microphone algorithm is theoretically analyzed. The feedback controller and the secondary channel model are designed to keep the algorithm stable under different hearing aid wearing modes, and achieve high noise attenuation and high stability. The experimental results show that the application of virtual microphone can obtain higher attenuation of narrowband noise in the ear canal, and the measures taken to ensure that the hearing protector can be stable under different wearing conditions.