Variable step-size based-adaptive algorithm for acoustic feedback cancellation during online operation of ANC systems

2015 ◽  
Author(s):  
Shakeel Ahmed ◽  
Muhammad Tahir Akhtar ◽  
Xi Zhang
Keyword(s):  
Adaptive Algorithm ◽  
Variable Step Size ◽  
Step Size ◽  
Feedback Cancellation ◽  
Acoustic Feedback ◽  
Variable Step

DESIGN OF A VARIABLE STEP-SIZE FILTERING ALGORITHM FOR ACOUSTIC FEEDBACK CANCELLATION IN AUDIO SYSTEMS

2005 ◽  
Vol 05 (03) ◽  
pp. L387-L395
Author(s):  
JIAN-DA WU ◽  
HAI-PING LIN ◽  
RAN-JEN HUNG
Keyword(s):  
Adaptive Filter ◽  
Convergence Speed ◽  
Projection Algorithm ◽  
Variable Step Size ◽  
Step Size ◽  
Feedback Cancellation ◽  
Affine Projection ◽  
Acoustic Feedback ◽  
Affine Projection Algorithm ◽  
Variable Step

Acoustic feedback often limits the maximum usable gain of acoustic systems and degrades the overall system response. It is well known to be detrimental that the system stability and performance must be taken into account in system design. Most of the conventional methods for acoustic feedback cancellation in an acoustic system are based primarily on an adaptive filter with the least-mean-square (LMS) error algorithm. Unfortunately, convergence speed is often limited when a sound source or a filtering plant is varied, because the learning process of the adaptive algorithm fails to respond fast enough to changing operational conditions. This report proposes a variable step-size affine-projection algorithm (VSS APA) for acoustic feedback cancellation in audio systems. The proposed adaptive filter is based on the filtering affine-projection algorithm with variable step-size for improving convergence speed in acoustic feedback cancellation. A performance evaluation and simulation comparison has been conducted to compare the proposed algorithm and various traditional adaptive filtering algorithms.

A Variable Step Size LMS Adaptive Filtering Algorithm and Simulations Based on Computational Verb Theory

2013 ◽  
Vol 756-759 ◽  
pp. 3972-3976 ◽  
Author(s):  
Li Hui Sun ◽  
Bao Yu Zheng
Keyword(s):  
Adaptive Filtering ◽  
Adaptive Algorithm ◽  
Linear Functional ◽  
Functional Relationship ◽  
Lms Algorithm ◽  
Variable Step Size ◽  
Step Size ◽  
Filtering Algorithm ◽  
Variable Step ◽  
Simulation Results

Based on traditional LMS algorithm, variable step LMS algorithm and the analysis for improved algorithm, a new variable step adaptive algorithm based on computational verb theory is put forward. A kind of sectorial linear functional relationship is established between step parameters and the error. The simulation results show that the algorithm has the advantage of slow change which is closely to zero. And overcome the defects of some variable step size LMS algorithm in adaptive steady state value is too large.

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