Pre-inverse Active Noise Control System Using Inverse Transfer Function Estimation of Secondary Path with Auxiliary Filter

Multichannel active noise control algorithms using inverse filters

1.0 Introduction For active noise control (ANC) systems, a common approach is to use adaptive FIR filters trained with the filtered-x LMS algorithm [1], for both feedforward systems and Internal Model Control (IMC) feedback systems, in monochannel or multichannel systems. Variations of the algorithm sometimes called the modified filtered-x LMS algorithm have been published [2], which can achiev...

Adaptive Active Noise Control System for Secondary Path Fluctuation Problem

An effective active noise control (ANC) system, based on identifying the so-called secondary path, can cancel the undesired noise. However, in some ANC applications, secondary path fluctuation will degrade the performance of noise cancellation. This paper proposes a novel average value algorithm with conventional filtered-X lease mean square (FXLMS) method to solve this problem. A method to tun...

An Active Noise Control without Estimation of Secondary-path – Anc Using Simultaneous Perturbation –

A New Online Secondary Path Modeling Method with An Auxiliary Noise Power Scheduling Strategy for Narrowband Active Noise Control Systems

In recent years, the online secondary path modeling (SPM) method with an auxiliary noise power scheduling strategy has been crucial for active noise control (ANC) systems and has also become a popular research topic. However, most scheduling strategies have been designed for broadband active noise control (BANC), and these ideas may not be directly applied to narrowband active noise control (NA...

Inverse structure for active noise control and combined active noise control/sound reproduction systems

In this paper, a simple inverse structure for multichannel active noise control (ANC) is introduced, based on the use of noncausal models of the (pseudo-)inverse plant between the error sensors (typically microphones in ANC systems) and the actuators (typically loudspeakers). This structure, combined with adaptive FIR filters and filtered-x LMS-based algorithms, can produce both a reduction of ...