Feedback Path-Tracking Pre-Inverse Type Active Noise Control

Keisuke OKANO
Yoshio ITOH

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E104-A    No.7    pp.954-961
Publication Date: 2021/07/01
Publicized: 2020/12/28
Online ISSN: 1745-1337
DOI: 10.1587/transfun.2020EAP1081
Type of Manuscript: PAPER
Category: Digital Signal Processing
active noise control (ANC),  auxiliary-noise power-scheduling,  digital signal processing (DSP),  

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We propose online feedback path modeling with a pre-inverse type active noise control (PIANC) system to track the fluctuation stably in the feedback path. The conventional active noise control (ANC) system with online feedback path modeling (FBPM) filter bases filtered-x least mean square (FxLMS) algorithm. In the FxLMS algorithm, the error of FBPM influences a control filter, which generates an anti-noise, and secondary path modeling (SPM) filter. The control filter diverges when the error is too large. Therefore, it is difficult for the FxLMS algorithm to track the feedback path without divergence. On the other hand, the proposed approach converges stably because the FBPM filter's error does not influence a control filter on the PIANC system. Thus, the proposed method can reduce noise while tracking the feedback path. This paper verified the effectiveness of the proposed method by convergence analysis, computer simulation, and implementation of a digital signal processor.