中文

Journal of Applied Sciences ›› 2012, Vol. 30 ›› Issue (3): 256-262.doi: 10.3969/j.issn.0255-8297.2012.03.007

• Signal and Information Processing • Previous Articles     Next Articles

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

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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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