Online acoustic feedback mitigation with improved noise-reduction performance in active noise control systems

The main focus of this paper is the acoustic feedback path neutralisation during online operation of the single-channel active noise control (ANC) systems. Invasive techniques, in which additive auxiliary noise is injected for online feedback path modelling (FBPM), degrade the noise-reduction performance of ANC systems. In the existing methods for online FBPM, additive auxiliary noise with fixed variance is injected during all operating conditions of ANC systems. In this paper, a scheduling strategy is proposed to have time-varying gain for additive auxiliary noise. The time-varying gain is computed on the basis of (i) the convergence status of the FBPM filter, and (ii) the power of the interference term in the error signal of the FBPM filter. Simulation results show that, compared to the existing methods, the proposed method can better achieve the conflicting requirements of fast convergence of the FBPM filter, and reduced steady-state power of the residual error at the error microphone. For sake of completeness, appendix presents typical simulation results when both the secondary path and feedback path are simultaneously identified during online operation of ANC systems.

[1]  Xi Zhang,et al.  Robust Auxiliary-Noise-Power Scheduling in Active Noise Control Systems With Online Secondary Path Modeling , 2013, IEEE Transactions on Audio, Speech, and Language Processing.

[2]  Ming Zhang,et al.  Cross-updated active noise control system with online secondary path modeling , 2001, IEEE Trans. Speech Audio Process..

[3]  Larry J. Eriksson,et al.  The selection and application of an IIR adaptive filter for use in active sound attenuation , 1987, IEEE Trans. Acoust. Speech Signal Process..

[4]  Masayuki Kawamata,et al.  A simplified method for online acoustic feedback path modeling and neutralization in multichannel active noise control systems , 2009, Signal Process..

[5]  H. G. Leventhall,et al.  Active attenuation of noise: The Chelsea dipole , 1981 .

[6]  Sen M. Kuo,et al.  A secondary path modeling technique for active noise control systems , 1997, IEEE Trans. Speech Audio Process..

[7]  Masayuki Kawamata,et al.  Noise power scheduling in active noise control systems with online secondary path modeling , 2007, IEICE Electron. Express.

[8]  Larry J. Eriksson.  Recursive Algorithms for Active Noise Control (人と環境との調和をめざすアクティブ消音) , 1991 .

[9]  예후다 메이만,et al.  Active noise control system and method , 2004 .

[10]  Sen M. Kuo,et al.  Active Noise Control Systems: Algorithms and DSP Implementations , 1996 .

[11]  Alberto Carini,et al.  Optimal Variable Step-Size NLMS Algorithms With Auxiliary Noise Power Scheduling for Feedforward Active Noise Control , 2008, IEEE Transactions on Audio, Speech, and Language Processing.

[12]  Masayuki Kawamata,et al.  On Active Noise Control Systems With Online Acoustic Feedback Path Modeling , 2007, IEEE Transactions on Audio, Speech, and Language Processing.

[13]  Muhammad Tufail,et al.  Acoustic feedback neutralization in active noise control systems , 2007, IEICE Electron. Express.

[14]  Zahid Mehmood,et al.  A new variable step size method for online feedback path modeling in active noise control systems , 2009, 2009 IEEE 13th International Multitopic Conference.

[15]  G B Chaplin,et al.  WAVEFORM SYNTHESIS -- THE ESSEX SOLUTION TO REPETITIVE NOISE AND VIBRATION , 1983 .

[16]  M. A. Swinbanks.  The active control of sound propagation in long ducts , 1973 .

[17]  Ming Zhang,et al.  A robust online secondary path modeling method with auxiliary noise power scheduling strategy and norm constraint manipulation , 2003, IEEE Trans. Speech Audio Process..

[18]  Masayuki Kawamata,et al.  A new variable step size LMS algorithm-based method for improved online secondary path modeling in active noise control systems , 2006, IEEE Transactions on Audio, Speech, and Language Processing.

[19]  Muhammad Tahir Akhtar,et al.  Variable step-size based method for acoustic feedback modeling and neutralization in active noise control systems , 2011 .

[20]  Muhammad Tahir Akhtar,et al.  Auxiliary noise power scheduling for on-line secondary path modeling in single channel feedforward active noise control systems , 2012, 2012 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP).