39 KMUTNB Int J Appl Sci Technol, Vol. 11, No. 1, pp. 39–44, 2018 Low Frequency Noise Reduction with Active Noise Control in Laboratory Settings Suparoek Junsupasen * Department of Instrumentation and Electronics Engineering, Faculty of Engineering, King Mongkut’s University of Technology North Bangkok, Bangkok, Thailand Witthawas Pongyart Department of Electrical and Computer Engineering, Faculty of Engineering, King Mongkut’s University of Technology North Bangkok, Bangkok, Thailand Manutchanok Jongprasithporn Department of Industrial Engineering, Faculty of Engineering, King Mongkut’s Institute of Technology Ladkrabang, Bangkok, Thailand Nantakrit Yodpijit Center for Innovation in Human Factors Engineering and Ergonomics, Department of Industrial Engineering, Faculty of Engineering, King Mongkut’s University of Technology North Bangkok, Bangkok, Thailand * Corresponding author. E-mail: suparoek.j@eng.kmutnb.ac.th DOI: 10.14416/j.ijast.2018.01.002 Received: 15 February 2017; Accepted: 5 June 2017; Published online: 5 January 2018 © 2018 King Mongkut’s University of Technology North Bangkok. All Rights Reserved. Abstract Noise problem becomes a major concern for public health throughout the world. This research is conducted to investigate how to reduce low-frequency noise in laboratory settings using Active Noise Control (ANC) technique. Experiments are performed under two conditions: 1) in a close room (6.7 m wide, 11 m long, and 2.87 m high), and 2) in an open field (8.2 m wide and 18 m long). Low-frequency noise at 200 Hz is generated by the 1,000 W speaker (as noise source), and the 1,200 W speaker is used as noise cancelling speaker. Error microphone and spectrum analyzer are installed for measuring noises. Findings indicate that noise reductions of 14.38 dB and 10.73 dB can be made in a close room and in an open field, respectively. Applications and limitations for this research are also discussed. Keywords: Noise, Laboratory, Open field, Active Noise Control (ANC) Research Article 1 Introduction Noise has become a serious environmental problem in many countries around the world. Exposure to noise should be controlled and is now a large public concern. The extent of the ambient noise problem is becoming more and more critical since the community population has changed and increased significantly. In contrast to many other environmental issues, noise problem continues to grow and causes an increase in complaints. Many studies indicates that noise leads to several health problems (for example, high blood pressure [1], cardiovascular disease [2], [3], physiological health issues, mental stress, sleep disturbance [1], [2], [4]–[7]) and results in a significant increase in medical expenses for public and private Please cite this article as: S. Junsupasen, W. Pongyart, M. Jongprasithporn, and N. Yodpijit, “Low frequency noise reduction with active noise control in laboratory settings,” KMUTNB Int J Appl Sci Technol, vol. 11, no. 1, pp. 39–44, Jan.–Mar. 2018.