一种广义旁瓣抵消器结构的语音增强改进算法

Improved Speech Enhancement Algorithm with Generalized Sidelobe Canceller

当广义旁瓣抵消器(Generalized sidelobe canceller,GSC)结构的语音增强算法对语音信号的入射方向角估计不准确时,阻塞矩阵(Blocking matrix,BM)不能完全阻塞目标语音,使得部分语音通过阻塞矩阵,在后期多输入抵消器(Multiple-input canceller,MC)模块中和参考信号相抵消,造成目标语音的损失。针对广义旁瓣抵消器因信号到达方向(Direction of arrival,DOA)估计误差而导致语音泄漏的问题,本文提出了一种麦克风阵列语音增强的优化算法,先对经过时延补偿的信号进行频谱调整,再利用MC模块输出与BM模块输出存在相关性的特点,对阻塞矩阵进行自适应调整,使方向估计参数更趋近于真实目标语音方向,以减少阻塞矩阵中目标语音的泄漏。仿真结果表明,该算法可以有效减少阻塞矩阵中目标语音的泄漏、增强系统的鲁棒性以及提高语音增强效果。

In speech enhancement algorithm based on generalized sidelobe canceller （GSC）, when there is an error in direction estimating, the target speech cannot be blocked by blocking matrix （BM） module completely. Then in the multiple-input canceller （MC） module, the target speech will he eliminated, which will cause the leakage of the target speech. In this paper, a new optimization algorithm is proposed for the leakage of the speech caused by the error of signal direction of arrival （DOA）. First, we adjust the spectrum of the signal with time delay compensation, then the blocking matrix would be adjusted adaptively according to the characteristics of the correlation between the final output of MC module and the output of BM module. The estimated direction can be closer to the real target speech direction in order to reduce the leakage of the target speech. Simulation results show that the proposed algorithm has better speech enhancement performances in both objective and subjective evaluations.