东南大学学报（自然科学版）Issue(3)：417-422,6.DOI:10.3969/j.issn.1001-0505.2015.03.001
应用于助听器反馈抑制系统的变步长归一化子带自适应滤波算法
Variable step size normalized sub-band adaptive filter algorithm for acoustic feedback cancellation in hearing aids
摘要
Abstract
A variable step size normalized sub-band adaptive filter ( VSS-NSAF ) algorithm for acoustic feedback cancellation in hearing aids is proposed to alleviate the confliction between the fast convergence rate and the low misalignment in adaptive filter algorithms.In this algorithm, the nor-malized distance between the short term average and the long term average of the filter coefficients is utilized to classify the filter updating states as convergent state, transitional state and steady state. Different step sizes are employed adaptively in different updating states.A large step size is adopted in the convergent state to ensure fast convergence.In the transitional state, a declining lady-like step size is employed to further lower misalignment.In order to make sure the system can finally con-verge, a small step size is used in steady state.The simulation results illustrate that compared with the traditional normalized least mean square ( NLMS) algorithm and other sub-band adaptive filter algorithms, the proposed algorithm has the faster convergence rate and lower average steady mis-alignment.关键词
子带自适应滤波/声反馈抑制/助听器/变步长Key words
sub-band adaptive filter/acoustic feedback cancellation/hearing aids/variable step size分类
信息技术与安全科学引用本文复制引用
王侠,梁瑞宇,王青云,唐加能,赵力,邹采荣..应用于助听器反馈抑制系统的变步长归一化子带自适应滤波算法[J].东南大学学报（自然科学版）,2015,(3):417-422,6.基金项目
国家自然科学基金资助项目（61273266，61301219，61375028）、教育部博士点基金资助项目（20110092130004）、中央高校基本科研业务费专项资金资助项目（2242013 K30010）、江苏省自然科学基金资助项目（ BK20130241）、泉州市科技计划资助项目（2014Z103）． （）
