A variable step size modified decorrelated NLMS algorithm for adaptive feedback cancellation in hearing aids

Rotaru, Marius; Albu, Felix; Coanda, Henri

doi:10.1109/isetc.2012.6408070

Cited by 32 publications

(11 citation statements)

References 20 publications

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“…Besides the examples above, applications to such problems as antenna beamforming [2, p. 101], howling suppression [7], and feedback cancellation in hearing aids [8,9] have also been reported.…”

Section: Adaptive Filter and Its Application Areasmentioning

confidence: 98%

Introduction

Ozeki

2015

Theory of Affine Projection Algorithms for Adaptive Filtering

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Section: Adaptive Filter and Its Application Areasmentioning

confidence: 98%

Introduction

Ozeki

2015

Theory of Affine Projection Algorithms for Adaptive Filtering

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“…To verify its performance, the JEC algorithm is compared with NLMS, the nonparametric variable step size normalized least‐mean‐square (NPVSS‐NLMS) , and the variable step size modified NLMS (VSS‐MNLMS) . Among them, NPVSS‐NLMS is derived as a general variable step size for the NLMS.…”

Section: Experiments Setupmentioning

confidence: 99%

A joint echo cancellation algorithm for quick suppression of howls in hearing aids

Liang

Wang

et al. 2017

IEEJ Transactions Elec Engng

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When the echo path of a hearing aid suddenly changes, howls easily occur. To quickly suppress the howls, a joint echo cancellation (JEC) algorithm, which combines the variable step normalized least mean square (VNLMS) algorithm with the notch filter algorithm, is proposed. According to whether the hearing aid howls or not, different strategies are used. First, when there are no howls, the echo signal is estimated using VNLMS and the step factor is computed according to three types of filter states, which are defined based on the normalized distance between the short-term average and the long-term average of the filter coefficients. Then, different step factors are used for different states. Second, when there are howls, the update of VNLMS is frozen to stabilize the howl frequency. To improve the detection accuracy, a howling detection algorithm based on the zoom-fast Fourier transformation (ZoomFFT) is proposed. The ZoomFFT algorithm can analyze the spectrum of a narrowband signal in a specified high sampling frequency. Then, the notch filters based on the estimated howl frequencies are dynamically generated to restrain the howls. Finally, when the howls are suppressed, VNLMS is reactivated. Compared to other echo cancellation algorithms, the proposed algorithm can quickly suppress the howls, and JEC has the best comprehensive performance. Furthermore, the quality of the processed speech is high, and the operation time is short. Thus, the proposed algorithm is suitable for low-power-consumption and small-volume products such as hearing aids.

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“…It is known that there is a bias in the estimate of the feedback path in the case of AFC due to the correlation between the input and output signals of the hearing aids. Several solutions for this problem have been proposed based on decorrelation filters [6], [10]- [11]. Moreover, different AP algorithms employing variable stepsize [12], variable regularization [13]- [14], set-membership filtering [15], and variable projection order [16]- [18] have also been proposed.…”

Section: Introductionmentioning

confidence: 99%

Intermittently-updated affine projection algorithm

Albu

Rotaru

Arablouei

et al. 2013

2013 IEEE International Conference on Acoustics, Speech and Signal Processing

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Acoustic echo cancellation and feedback cancellation systems require robust and computationally efficient adaptive filtering techniques. In this paper, a new affine projection algorithm with intermittent update of the filter coefficients is proposed where the update interval is determined according to the adaptation state. Simulation results show that the proposed algorithm provides improved performance and reduced average computational complexity compared with other similar algorithms for acoustic echo cancellation and acoustic feedback cancellation applications.Index Terms-Acoustic echo cancellation, acoustic feedback cancellation, affine projection algorithm, variable update interval

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A variable step size modified decorrelated NLMS algorithm for adaptive feedback cancellation in hearing aids

Cited by 32 publications

References 20 publications

Introduction

Introduction

A joint echo cancellation algorithm for quick suppression of howls in hearing aids

Intermittently-updated affine projection algorithm

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