scholarly journals Dual-Zone Active Noise Control Algorithm

2019 ◽  
Vol 10 (1) ◽  
pp. 4
Author(s):  
Ran Wang ◽  
Xiaolin Wang ◽  
Jingwei Liu ◽  
Jun Yang
Keyword(s):  
Noise Reduction ◽  
Least Squares ◽  
Control Algorithm ◽  
Noise Control ◽  
Active Noise Control ◽  
Sound Field ◽  
Secondary Source ◽  
Sound Power ◽  
Control Zone ◽  
Active Noise

When active noise control (ANC) is applied to acquire a ‘quiet zone’, it may produce an increase in the sound power outside the quiet zone and a change in the primary sound field, which are undesirable in anti-detection and personal audio. To obtain a large noise reduction in the control zone and a small increase of sound power outside the control zone, three wideband ANC algorithms are proposed based on the acoustic contrast control (ACC), least-squares (LS), and least-squares with acoustic contrast control (SFR-ACC) algorithms. With a loudspeaker array as the secondary source, dual-zone ANC with directivity, which realizes noise reduction in one zone without changing the sound power in the other zone, is achieved. Compared with the traditional LS algorithm, the three algorithms proposed in this paper can not only realize that the sound power outside the control zone is increased by less than 1 dB, but also reduce the noise in the control zone by more than 10 dB, which provides a new solution to multi-zone ANC research.

KTX Interior-Noise Reduction Performance Comparison Using Multichannel Active-Noise Control

2012 ◽  
Vol 152-154 ◽  
pp. 1891-1898
Author(s):  
Hyeon Seok Jang ◽  
Young Min Kim ◽  
Saehan Kim ◽  
Taeoh Lee ◽  
Kwon Soon Lee
Keyword(s):  
Noise Reduction ◽  
High Speed ◽  
Noise Control ◽  
Active Noise Control ◽  
Sound Field ◽  
Performance Comparison ◽  
High Speed Rail ◽  
Active Noise ◽  
Tunnel Section ◽  
Fxlms Algorithm

In many countries, the use of the KTX high-speed rail has been generalized of late. Therefore, its customers who initially pursued only convenience and speed have begun pursuing quality services such as comfort and stability. Thus, the importance of reducing the noise in the high-speed rail is increasing. The active noise is best choice to reduce noise because of being able to actively reduce the ambient noise coming from the environmental-factor changes. But it’s too hard in a three-dimensional closed-space sound field such as the interior of a high-speed rail. In this study, we used multichannel(2x2) FXLMS algorithm for applying ANC system in KTX. In detail, after measuring the noise inside KTX during its runs in South Korea, multichannel active noise control was simulated to determine the extent to which it can reduce the noise inside KTX. Simulation was done using a multichannel FXLMS algorithm for reducing the actual noise inside KTX and the noise reduction in the open-space section of KTX was compared with that in the tunnel section, and the active-noise-control performances in the low-frequency (below 500 Hz) region were compared.

Effect of a tilting reflective plane on the performance of an active noise control system

2021 ◽  
pp. 107754632110317
Author(s):  
Sajaad Boodoo ◽  
Mohammad R Paurobally ◽  
Yasdeo Bissessur
Keyword(s):  
Control System ◽  
Noise Reduction ◽  
Noise Control ◽  
Single Channel ◽  
Active Noise Control ◽  
Real Life ◽  
Orientation Angle ◽  
Secondary Source ◽  
Living Room ◽  
Active Noise

This article presents the results of an investigation of the noise reduction performance of a single-channel active noise control system in the presence of a tilting reflective plane. It is shown that the noise reduction achieved by the system depends upon the orientation angle of the panel and on the separation distances between both the primary and the secondary source and the reflective panel. It is also observed that the maximum noise reduction is obtained when the reflective panel is vertical and when the separation distance is less than about 0.13 of the wavelength at the frequency of interest. When the panel is moved away, the maximum noise reduction occurs at other tilting angles. Experiments were carried out in a real living room which is close to real-life situations. It is found that there is an improvement in the extent of the quiet zone in the presence of the panel. The reduction in sound pressure level is also better with the reflective panel, which is up to 20 dB.

A narrowband active noise control algorithm considering the harmonic distortion of the loudspeaker

2020 ◽  
Vol 64 (1-4) ◽  
pp. 229-235
Author(s):  
Yinshan Cai ◽  
Longlei Dong ◽  
Yanxin Zhou
Keyword(s):  
Noise Reduction ◽  
Control Algorithm ◽  
Detrimental Effect ◽  
Noise Control ◽  
Active Noise Control ◽  
Harmonic Distortion ◽  
Least Mean Square ◽  
Active Noise ◽  
Least Mean Square Algorithm ◽  
Conventional Algorithm

Electrodynamic loudspeakers are the main actuators of the active noise control system, and their harmonic distortion has a detrimental effect on the noise reduction of the system. To improve the performance, this paper proposes a novel narrowband active noise control algorithm with compensating the nonlinearity of the loudspeaker. In the proposed algorithm, the parameters of the controller are obtained by iteration through the filtered-x least mean square algorithm. Meanwhile, they are adjusted in real-time by establishing the online inverse model of the loudspeaker using the Volterra expansion. The simulation experiments for the typical loudspeaker model show that the proposed algorithm can dramatically improve noise reduction compared to the conventional algorithm.

Secondary Source Modeling Based on Analogue Circuits of Electrical Mechanical and Acoustical Systems

2011 ◽  
Vol 328-330 ◽  
pp. 2265-2269
Author(s):  
Yong Hong Nie ◽  
Jun Sheng Cheng
Keyword(s):  
Control System ◽  
Transfer Function ◽  
Noise Reduction ◽  
Noise Control ◽  
Active Noise Control ◽  
Secondary Source ◽  
Source Modeling ◽  
Ideal Model ◽  
Active Noise ◽  
Analogue Circuits

A method of secondary source modeling based on analogue circuits of electrical, mechanical and acoustical systems (SSM-ACEMAS) was provided in order to reduce the mismatch of transfer function estimation of secondary path in the simulation of active noise control (ANC) system. The convergence range and noise reduction performance of the system with SSM-ACEMAS and Filtered-X LMS algorithm were investigated. The results show that the transfer function of such a secondary source model has different amplitude and phase from the ideal model, which makes the noise reduction performance of an ANC system be much worse than the one with ideal model. Meantime, the convergence range of the control system is increased at low frequencies while decreased at high frequencies. The proposed model can provide a new method of secondary source modeling for further research on the simulation of active noise control system.

Application of a Multipole Secondary Source for Propeller Active Noise Control

2014 ◽  
Vol 564 ◽  
pp. 135-142 ◽  
Author(s):  
Muhammad Kusni ◽  
Benjamin Soenarko ◽  
Harijono Djojodihardjo
Keyword(s):  
Noise Reduction ◽  
Noise Control ◽  
Free Field ◽  
Active Noise Control ◽  
Secondary Source ◽  
Frequency Noise ◽  
Secondary Sources ◽  
Active Noise ◽  
Novel Approach ◽  
Active Noise Reduction

The commercial feasibility of active noise control (ANC) is very promising due to its capability beyond passive noise control (PNC). To some extent ANC becomes a complement of PNC. The active noise reduction is also capable and beneficial in reducing noise selectively. However, the active noise reduction using a conventional secondary source can become very complicated if a significant noise level reduction is required, since a large number of secondary sources will be needed. The active noise reduction is also less effective for reducing high-frequency noise. With such perspectives, a novel approach has been developed using a multipole secondary source to addressthe problems mentioned. In addition, the multipole secondary source will be used for numerical simulation of noise reduction in of propeller noise source in a free field.

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