scholarly journals Noise analysis and active noise control strategy of transcranial magnetic stimulation device

AIP Advances ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 085010
Author(s):  
Chang Liu ◽  
Hongfa Ding ◽  
Xiao Fang ◽  
Zhou He ◽  
Zhixun Wang
Keyword(s):  
Transcranial Magnetic Stimulation ◽  
Control Strategy ◽  
Magnetic Stimulation ◽  
Noise Control ◽  
Noise Analysis ◽  
Active Noise Control ◽  
Active Noise

scholarly journals Multi-Zone Active Noise Control Strategy for the Scattered Sound Control of an Infinite Rigid Cylinder

2021 ◽  
Vol 11 (21) ◽  
pp. 10011
Author(s):  
Yuwei Feng ◽  
Xiaolin Wang ◽  
Xiaoyan Cui ◽  
Ming Wu ◽  
Jun Yang
Keyword(s):  
Control Strategy ◽  
Acoustic Waves ◽  
Noise Control ◽  
Active Noise Control ◽  
Target Area ◽  
Rls Algorithm ◽  
Rigid Cylinder ◽  
Active Noise ◽  
Sound Control ◽  
Sound Amplification

Active noise control can be used to reduce the scattered sound of a reflecting object to make it invisible to incident acoustic waves. For the multi-zone active noise control of scattered sound from an infinite rigid cylinder, an active control strategy is proposed that combines the least absolute shrinkage and selection operator (LASSO) algorithm with constraint points and regularized least squares (RLS) algorithm. The proposed control strategy is used to promote control performance through optimizing the secondary loudspeaker placement of an active noise control system. Compared with the RLS algorithm employing the uniformly placed loudspeakers and the traditional LASSO algorithm, the proposed strategy has better reduction performance both in the forward-scattered and backward-scattered sound target areas, and there is less sound amplification in the far field. From 400 Hz–1100 Hz, the proposed strategy provides a 5 dB–16 dB reduction performance advantage in the target area compared to the RLS algorithm employing uniformly placed loudspeakers.

Application of Specific Loudness in Active Noise Control inside Passenger Car

2012 ◽  
Vol 482-484 ◽  
pp. 1045-1050
Author(s):  
Deng Feng Wang ◽  
Gang Ping Tan ◽  
Shu Ming Chen ◽  
Jian Gang Zhang
Keyword(s):  
Computer Simulation ◽  
Control Strategy ◽  
Noise Control ◽  
Active Noise Control ◽  
Objective Evaluation ◽  
Sound Quality ◽  
Active Noise ◽  
Before And After ◽  
Quality Objective ◽  
Computational Procedures

Loudness which is one of the psycho-acoustic metrics is an important parameter in the model of sound quality objective evaluation. In this paper, based on two standards, two computational procedures of loudness were programmed and verified respectively, and these verified results showed that the two computational procedures are stable and reliable. Based on these characteristics of specific loudness curve, control strategy which selectively attenuates the peak values of specific loudness is proposed to solve the problem of active noise control inside vehicle. A computer simulation with this strategy is conducted and the changes of specific loudness and loudness before and after active noise control are analyzed. The results indicate that it is significant to reduce the peak values of specific loudness by using this control strategy, and then the reduction in loudness of noise is up to 1.5 sones.

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