An investigation on the effect of acoustic feedback in a single-channel active noise control system

2004 ◽  
Author(s):  
J. Poshtan ◽  
S. Sadeghi ◽  
M.H. Kahaei
Keyword(s):  
Control System ◽  
Noise Control ◽  
Single Channel ◽  
Active Noise Control ◽  
Acoustic Feedback ◽  
Active Noise

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.

Evaluation of a hybrid active noise control system with acoustic feedback

2010 ◽  
Author(s):  
Edgar Lopez ◽  
Paula Colunga ◽  
Rogelio Bustamante ◽  
Mariko Nakano-Miyatake ◽  
Hector Perez-Meana
Keyword(s):  
Control System ◽  
Noise Control ◽  
Active Noise Control ◽  
Acoustic Feedback ◽  
Active Noise

scholarly journals Fuzzy logic feedforward active noise control with distance ratio and acoustic feedback using Takagi–Sugeon–Kang inference

2019 ◽  
Vol 39 (1) ◽  
pp. 174-189
Author(s):  
Tongrui Peng ◽  
Quanmin Zhu ◽  
M. Osman Tokhi ◽  
Yufeng Yao
Keyword(s):  
Fuzzy Logic ◽  
Control System ◽  
Fuzzy Logic Control ◽  
Noise Control ◽  
Active Noise Control ◽  
Distance Ratio ◽  
Acoustic Feedback ◽  
Logic Control ◽  
Active Noise ◽  
Fxlms Algorithm

Noise, as undesired sound, severely affects the quality of human life. Currently, active noise control method has demonstrated its capability in low-frequency noise cancellation and the advance in saving money and reducing weight and volume of related materials used in the passive noise control technology. The widespread configuration for active noise control technology is finite impulse response filter with filtered-x least mean squares (FxLMS) algorithm. However, the nonlinearities in the secondary path, which mainly arise from sensors, actuators and amplifiers used in the active noise control system, will cause instability and degrade the performance while using the FxLMS algorithm. In order to cope with this challenge, many new approaches have been proposed and fuzzy logic control is one of these. In this paper, a Takagi–Sugeon–Kang-type fuzzy logic control-based feedforward active noise control system with focus on the geometry configuration is introduced. In contrast to previous work, all physical paths are modelled by pure time delay transfer function and the acoustic feedback is added as part of inputs for the fuzzy logic control. Computational experiments are implemented within the Matlab/Simulink platform, and several case studies are presented with time and frequency domain analyses to demonstrate the cancellation ability of the proposed feedforward active noise control system and investigate the influence of distance ratio on the overall noise cancellation performance.

Modelling and simulation of active noise control in a small room

2016 ◽  
Vol 24 (3) ◽  
pp. 607-618 ◽  
Author(s):  
Fauzi Aslan ◽  
Roshun Paurobally
Keyword(s):  
Control System ◽  
Noise Control ◽  
Single Channel ◽  
Active Noise Control ◽  
Single Frequency ◽  
Frequency Noise ◽  
Sensors And Actuators ◽  
Multichannel System ◽  
Active Noise ◽  
Small Room

This paper presents the modeling and simulation results of active noise control (ANC) in a small room using the wave-based approach defined by particle velocities and sound pressure within the defined boundary conditions. The ANC system excitation is a single-frequency noise with an adaptive feedforward configuration. The Finite Difference Time Domain (FDTD) algorithm is used to model the room acoustics due to a boxed loudspeaker of single frequency. A control system based on the filtered-x least mean-squared (FxLMS) algorithm is utilized to synthesize a cancelling noise using a secondary loudspeaker. The single channel system is modified into a multichannel system and genetic algorithm (GA) is used to optimize the sensors and actuators placements simultaneously. Numerical results are plotted to demonstrate the performance of the control system. These show that the numerical modelling technique can be used to combine room acoustic simulation and FxLMS adaptive control. This provides a way for the optimum placement of the microphones and loudspeakers before being used in a practical complex enclosure.

Sign in / Sign up

Export Citation Format

Share Document