数字助听器的并行梯度投影回声抵消  

Acoustic Feedback Cancellation Based on Parallel Gradient Projection in Hearing Aids

作　　者：梁瑞宇[1,2] 赵力[2] 王青云[3] 奚吉[1] 张学武[1] 

机构地区：[1]河海大学计算机与信息学院,南京210098 [2]东南大学信息科学与工程学院,南京210096 [3]南京工程学院通信工程学院,南京211167

出　　处：《应用科学学报》2012年第3期256-262,共7页Journal of Applied Sciences

基　　金：国家自然科学基金(No.60872073,No.60975017);江苏省自然科学基金(No.BK2008291);中央高校基本科研业务费专项资金(No.2009B32614,No.2009B32014)资助

摘　　要：自适应回声抵消是消除助听器回声啸叫的有效方法.针对回声路径评估偏差大的问题,文中提出线性预测-并行梯度投影算法,通过对助听器输出信号进行线性预测来生成解相关FIR滤波器,获得解相关信号.系统利用解相关信号构建包含回声路径的凸优化方程,并设计并行梯度投影算法求解该方程,实现回声路径的估计.实验结果表明算法在收敛速度、稳定性和精度等方面改进显著.Adaptive feedback cancellation is an effective way to suppress echo howling in hearing aids. How- ever, when the external input signal is correlated with the receiver input signal, the estimate of the feedback path contains a large error. This paper proposes a linear prediction-parallel gradient projection algorithm, which generates a FIR filter to obtain the decorrelation signal by linear prediction of the output signals. The decorrelation signal is then used to build a convex optimization equation. With the parallel gradient projec- tion algorithm, the equation is solved to evaluate the echo path. Simulation results show clear improvement in convergence, stability and precision.

关 键 词：回声抵消 解相关 线性预测 并行梯度投影 助听器 

分 类 号：TN912[电子电信—通信与信息系统]