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Feedback active noise control based on transform-domain forward–backward LMS predictor

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Abstract

In this paper, a new feedback active noise control (FBANC) system based on the transform-domain forward–backward LMS (TFBLMS) predictor has been proposed. The new ANC system employs the TFBLMS predictor for its main-path (MP) predictor as well as for the noise canceller. To overcome the ill effect of the primary noise field, which acts as an observation noise for the secondary-path (SP) identification, the noise canceller is used. As the main-path predictor is based on the TFBLMS, its convergence rate improves due to its input orthogonalization. Further, its FBLMS nature reduces misadjustment. The use of TFBLMS predictor for noise canceller also gives a good prediction of primary noise at a faster rate, enabling improved SP identification. This improved SP identification indirectly aids the MP predictor to achieve an improved performance. A new filtered-x LMS structure has been proposed to realize the new MP predictor to accommodate the TFBLMS algorithm. The TFBLMS algorithm is applied directly to the noise canceller for SP identification. The proposed new ANC system has been found to have a significantly better noise reduction (by 14.6 dB) over the FBANC system based on tapped delay line time-domain FBLMS algorithm.

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Authors and Affiliations

  1. Department of Electronics and Communication Engineering, National Institute of Technology Karnataka (NITK), Surathkal, 575025, India

    S. Pavithra

  2. Aerospace Electronics and Systems Division, National Aerospace Laboratories (Affiliated to Council of Scientific and Industrial Research, New Delhi, India), Bangalore, 560017, India

    S. V. Narasimhan

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  1. S. Pavithra
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  2. S. V. Narasimhan
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Correspondence to S. V. Narasimhan.

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Pavithra, S., Narasimhan, S.V. Feedback active noise control based on transform-domain forward–backward LMS predictor. SIViP 8, 479–487 (2014). https://doi.org/10.1007/s11760-012-0357-6

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  • DOI: https://doi.org/10.1007/s11760-012-0357-6

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