A new adaptive strategy to improve online secondary path modeling in active noise control systems using fractional signal processing approach

• Published in: Signal processing 2015-02, Vol.107, p.433-443
• Main Authors: Aslam, Muhammad Saeed, Raja, Muhammad Asif Zahoor
• Format: Article
• Language: English
• Subjects: Active noise control; Fractional least mean square (LMS); Modified filtered-x least mean square (FxLMS); Online secondary path modeling
• ISSN: 0165-1684; 1872-7557
• DOI: 10.1016/j.sigpro.2014.04.012

In this paper, a new adaptive strategy based on fractional signal processing is proposed using multi-directional step size fractional least mean square algorithm for online secondary path modeling, which is a fundamental problem in practical active noise control systems, as opposed to the generally-employed increasing step size strategy that compromises model accuracy for faster convergence. The design approach presents step size strategy in relation with disturbance signal in the desired response of modeling filter which is not available directly so an indirect approach is used to track its variations. Comparative results for narrowband and broadband noise signals show that the proposed technique outperforms other state-of-the-art methods in terms of model accuracy and convergence rate. •A new scheme is designed for noise control as shown in Fig. 3.•The fractional LMS method is employed the ANC system.•The scheme uses variable step sizes to achieve fast convergence.•The proposed method achieves better performance in terms of accuracy and convergence speed.