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应用科学学报 ›› 2012, Vol. 30 ›› Issue (3): 256-262.doi: 10.3969/j.issn.0255-8297.2012.03.007

• 论文 • 上一篇    下一篇

数字助听器的并行梯度投影回声抵消

梁瑞宇1;3， 赵力3， 王青云2， 奚吉1， 张学武1   

  1. 1. 河海大学计算机与信息学院，南京210098
    2. 南京工程学院通信工程学院，南京211167
    3. 东南大学信息科学与工程学院，南京210096
  • 收稿日期:2011-01-06 修回日期:2011-07-29 出版日期:2012-05-30 发布日期:2012-05-30
  • 通信作者: 梁瑞宇，博士生，研究方向：语音信号处理，E-mail: lly1711@163.com；
  • 作者简介:梁瑞宇，博士生，研究方向：语音信号处理，E-mail: lly1711@163.com；赵力，教授，博导，研究方向：语音信号处理，E-mail:zhaoli@seu.edu.cn
  • 基金资助:

    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

Acoustic Feedback Cancellation Based on Parallel Gradient Projection in Hearing Aids

LIANG Rui-yu1;3, ZHAO Li3, WANG Qing-yun2, XI Ji1, ZHANG Xue-wu1   

  1. 1. College of Computer and Information, Hohai University, Nanjing 210098, China
    2. Nanjing Institute of Technology, School of Communication Engineering, Nanjing 211167, China
    3. School of Information Science and Engineering, Southeast University, Nanjing 210096, China
  • Received:2011-01-06 Revised:2011-07-29 Online:2012-05-30 Published:2012-05-30

PDF

1378

被引次数

11

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.

关键词: 回声抵消, 解相关, 线性预测, 并行梯度投影, 助听器

Abstract:

 Adaptive feedback cancellation is an effective way to suppress echo howling in hearing aids. However,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 projection algorithm, the equation is solved to evaluate the echo path. Simulation results show clear improvement in convergence, stability and precision.

Key words: acoustic feedback cancellation, decorrelation, linear prediction, parallel gradient projection, hearing aid

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