In order to improve the performance of general sidelobe canceller （GSC） based speech enhancement, a leakage constraints decision feedback generalized sidelobe canceller（LCDF-GSC） algorithm is proposed. The method ...In order to improve the performance of general sidelobe canceller （GSC） based speech enhancement, a leakage constraints decision feedback generalized sidelobe canceller（LCDF-GSC） algorithm is proposed. The method adopts DF-GSC against signal mismatch, and introduces a leakage factor in the cost function to deal with the speech leakage problem which is caused by the part of the speech signal in the noise reference signal. Simulation results show that although the signal-to-noise ratio （SNR） of the speech signal through LCDF-GSC is slightly less than that of DF-GSC, the IS measurements show that the distortion of the former is less than that of the latter. MOS （mean opinion score） scores also indicate that the LCDF-GSC algorithm is better than DF- GSC and the Weiner filter algorithm,展开更多
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,...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。展开更多
基金The National Natural Science Foundation of China(No60472058)the Ph.D.Programs Foundation of Ministry of Educa-tion of China(No20050286001)Program for New Century Excellent Talents in University(NoNCET-04-0483)
文摘In order to improve the performance of general sidelobe canceller （GSC） based speech enhancement, a leakage constraints decision feedback generalized sidelobe canceller（LCDF-GSC） algorithm is proposed. The method adopts DF-GSC against signal mismatch, and introduces a leakage factor in the cost function to deal with the speech leakage problem which is caused by the part of the speech signal in the noise reference signal. Simulation results show that although the signal-to-noise ratio （SNR） of the speech signal through LCDF-GSC is slightly less than that of DF-GSC, the IS measurements show that the distortion of the former is less than that of the latter. MOS （mean opinion score） scores also indicate that the LCDF-GSC algorithm is better than DF- GSC and the Weiner filter algorithm,
文摘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。
