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In a typical conventional narrowband active noise control (ANC) system, each reference (cosine or sine) wave is filtered by an FIR secondary-path estimate called x-filtering block. The number of x-filtering blocks is twice of the number of targeted frequencies (q), which may pose a bottleneck in system implementation. In this paper, we propose new efficient and robust narrowband ANC systems. An IIR-type...
Rotating machines such as diesel engines, cutting machines, fans, motors, etc., generate sinusoidal noise signals that may be effectively reduced by narrowband active noise control (ANC) systems. In this paper, a typical filtered-X LMS (FXLMS) based narrowband ANC system equipped with an online secondary-path modeling subsystem is analyzed in detail. First, difference equations governing the dynamics...
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