Horizontal Active Noise Control Based on Wave Field Reproduction Using a Single Circular Array in 3D Space

Ha, Sangwoo; Kim, Jung-Woo; Kim, Hyun-guk; Wang, Semyung

doi:10.3390/app122010245

Cited by 3 publications

(2 citation statements)

References 27 publications

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“…Feedforward FxLMS algorithms based on spherical harmonic decomposition are an interesting alternative in particular through the possibilities of Spherical Microphone Arrays (SMAs) and loudspeaker arrays design. Although real-time implementations of such methods are rare due to their complexity, a few experimental results are reported in the literature [6,7].…”

Section: Introductionmentioning

confidence: 99%

Experimental Active Noise Control Using Faust On FPGA: Comparison Between A Multi-Point And Spherical Harmonics Method

Alexandre,

Lecomte,

Galland

2024

Proceedings of the 10th Convention of the European Acoustics Association Forum Acusticum 2023

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Active noise control over an extended area is usually performed using multi-point pressure minimization. Recent advances in approaches using spherical harmonics, i.e. ambisonics, show to be attractive to control three dimensional acoustic fields. However, to this day, only few experimental results are reported in the literature. This paper proposes a preliminary experimental multichannel active noise control system implemented on a FPGA using the Faust programming language. Two multichannel Filtered-x LMS algorithms are tested to minimize either multi-point pressure or ambisonic components of the sound field. Both methods use the same four-microphone and four-loudspeaker geometrical arrangement which allows to work with first order ambisonics. A focus is made on the practical implementation of such systems to account for the difficulties associated with causality and computational load. The latter are solved to propose an operational real-time adaptive system. Experimental results are reported and show effective noise attenuation for both methods.

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Section: Introductionmentioning

confidence: 99%

Experimental Active Noise Control Using Faust On FPGA: Comparison Between A Multi-Point And Spherical Harmonics Method

Alexandre,

Lecomte,

Galland

2024

Proceedings of the 10th Convention of the European Acoustics Association Forum Acusticum 2023

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“…LFN is highly pervasive in buildings and is magnified by the modal field of enclosed spaces. The ANC principle has been widely adapted for LFN mitigation in rooms [6,7] and vehicles [8][9][10]. A thorough survey on ANC research and applications during the past decade can be found in [11,12].…”

Section: Introductionmentioning

confidence: 99%

Active Low-Frequency Noise Control Implementing Genetic Algorithm on Mode Coupling of a Compound Source

2023

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A system for low-frequency noise control in small, enclosed sound fields is proposed, using compound sound sources optimized by a genetic algorithm (GA). It is the integration of the developed low-Bl driver compound sources with a GA computer program in the Python language, aiming to control the modal field. The lack of appropriate free space in small rooms is critical for positioning the secondary sound sources; therefore, the proposed system has been designed to adapt to any available position. Two quadrupole topologies of the secondary compound source are applied and examined in a room. The convergence of the algorithm to the optimal solutions is attained through parametric configuration. The spatial radiation of the compound source at a single fixed position is adapted to couple with the modal noise field and attenuate it. The experimental results indicate that the proposed system can successfully control resonances of different low frequencies down to 50 Hz at multiple positions. The tonal noise attenuation reaches up to 32 dB at 100 Hz, confirming the applicability of the small subwoofer loudspeaker configurations for low-frequency control. This new method offers a practical and effective alternative to the typical abatement techniques that use distributed monopole sources in limited spaces.

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Design and analysis of experimental adaptive feedback system for active noise control (ANC) in a duct

Anachkova¹,

Pecioski²,

Domazetovska³

et al. 2023

J., mech. eng. autom., control. syst.

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The limitations of passive noise control methods impose a need for new technical solutions to solve the problem of reducing low-frequency noise, which is considered to be a dominant component of noise disturbance. In recent years, the subject of intensive research are the active noise control systems, which have aroused considerable interest and represent a promising solution to the problem of low-frequency noise control. This paper proposes a robust methodology for simplified design and analysis of an experimental active noise control system for real-time control of acoustic environment in a duct. The proposed feedback control model is based on using the LMS algorithm, combined with FxLMS algorithm for estimation and neutralization of the secondary path in the electro-acoustic system. The study shows the potential of the FPGA module and the Real-time module of cRIO from National Instruments, combined with the LabView software environment when applied in adaptive system for active noise control. The reliability and validity of the developed active noise control system is tested for a frequency range of 100 to 1000 [Hz], by measuring the amplitude-time domain in [V] and sound level in [dB]. The comparison of the experimental results shows great efficiency of the system at lower frequency range from 200 to 400 [Hz], where a maximum reduction in sound level achieved at a frequency of 200 [Hz] is 14 [dB] or 17 [%]. A significant sound level reduction is also achieved at both 300 [Hz] and 400 [Hz] which is 12 % or 10 [dB] in both cases. Given the analysis of the challenges and opportunities of the developed active noise control system, recommendations for advancements and future work are proposed.

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Horizontal Active Noise Control Based on Wave Field Reproduction Using a Single Circular Array in 3D Space

Cited by 3 publications

References 27 publications

Experimental Active Noise Control Using Faust On FPGA: Comparison Between A Multi-Point And Spherical Harmonics Method

Experimental Active Noise Control Using Faust On FPGA: Comparison Between A Multi-Point And Spherical Harmonics Method

Active Low-Frequency Noise Control Implementing Genetic Algorithm on Mode Coupling of a Compound Source

Design and analysis of experimental adaptive feedback system for active noise control (ANC) in a duct

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