摘要
现阶段主动降噪耳罩的功能主要是主动抑制环境强噪声,为佩戴者提供听力保护。有源降噪算法及耳罩被动隔声结构对噪声与语音信号均具有抑制功能,难以保证佩戴者之间在强噪声环境下进行有效交流对话。针对该不足,在利用麦克风阵列前提下,提出一种基于广义旁瓣抵消器(Generalized sidelobe canceller,GSC)的主动隔声耳罩语音增强算法。在改进的主动隔声耳罩中,通过滤波-X最小均方(Filter-X least mean square,FXLMS)算法及耳罩被动隔声结构对环境强噪声进行隔离抑制,而通过GSC增强环境中的语音信号并将其作为次级通道在线辨识激励耦合到主动降噪子系统中,由耳罩腔内的消声扬声器直接输出。同时,考虑到耳罩被动隔声结构良好的高频隔声性能,在主动降噪子系统中对其进行补偿设计,避免环境噪声中的高频分量被再次引入耳罩腔内。理论和仿真验证了算法有效性,在主动隔离环境强噪声的同时,能够保留较高可懂度的语音信号。
At present,the function of active noise-reduction earmuffs is mainly to actively suppress the strong ambient noise and protect the user’s hearing.The active noise reduction algorithm and the passive noise insulation structure of the earmuffs have the function of suppressing both noise and voice signals.So,it is difficult to ensure that the users conduct an effective communication one another in a strong noise environment.Aiming at this shortcoming,under the premise of using a microphone array,this paper proposes a speech enhancement algorithm for active noise cancelling for earmuffs based on generalized sidelobe canceller(GSC).After the earmuffs are improved,the strong ambient noise is isolated and suppressed by filter-X least mean square(FXLMS)algorithm and the passive sound insulation structure of earmuffs.The man-voice signal is enhanced by GSC and acts as a secondary channel for online identification and excitation.Then,it is coupled to the active noise reduction subsystem,which is directly output by the muffler speaker in the earmuff cavity.At the same time,considering that the passive noise insulation structure of the earmuffs has a good high-frequency sound insulation performance,it is compensated in the active noise reduction subsystem to prevent high-frequency components in ambient noise from being introduced into the earmuff cavity again.Both theoretical analysis and simulation verify the effectiveness of the algorithm,which can retain a highly intelligible voice signal when the strong environmental noise is actively isolated.
作者
李春峰
刘剑
王枝鑫
LI Chunfeng;LIU Jian;WANG Zhixin(College of Automation Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China)
出处
《噪声与振动控制》
CSCD
2020年第6期228-233,共6页
Noise and Vibration Control
基金
中央高校基本科研业务费专项资金资助项目(NS2016034)
校研究生创新基金资助项目(4003-016001)。
关键词
声学
降噪耳罩
有源噪声控制
麦克风阵列
GSC算法
语音增强
acoustics
noise reduction earmuff
active noise control
microphone array
GSC algorithm
speech enhancement
