基于改进广义旁瓣抵消器的语音增强

Speech Enhancement Based on Modified Generalized Sidelobe Canceller

为更好地抵消干扰信号,对广义旁瓣抵消器堵塞矩阵输出信号进行累加处理,得到与干扰信号相关性更强的信号,作为自适应干扰抵消器输入,提高了信干比增益;并提出了采用一个自适应干扰抵消器的系统简化结构。仿真结果表明,与广义旁瓣抵消器算法相比,当干扰信号源偏离目标信号源的角度越小时,该文提出的改进广义旁瓣抵消器算法及其简化算法可以获得7-9dB的信干比增益,且复杂度低。

To cancel the interfering signals more effectively,the output of the block matrix in the generalized sidelobe canceller(GSC) is accumulated and used as the input of the adaptive interference cancellers.Higher signal-to-interference ratio(SIR) improvement is achieved because the accumulated signals are higher correlation.Besides,a simplified architecture that has only one adaptive interference canceller is presented to reduce the complexity of the system.Simulations show that both the proposed modified GSC and its simplified algorithm can achieve 7 to 9 dB SIR improvement when the angle of the interference source is close to the one of the desired signal source.Their complexity is low.