Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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development of an ear-muff with active noise control for selective noise attenuation

특정주파수 소음제거를 위한 능동소음제어식 청각보호구 개발연구

  • Kim, Dong-Gyun (Graduate School of Chungbuk National University) ;
  • Kim, Ok-Hyeon (Dept. of Mechanical Engineering, Chungbuk National University)
  • 김동균 (충북대학교 대학원 기계공학과) ;
  • 김옥현 (충북대학교 기계공학과)
  • Published : 1997.12.01
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Abstract

Acoustic noise has become an increasingly important issue, especially in the industrial environment. Nowadays home and office are not exceptional, mainly due to the increase in the usage of machinery. Active Noise Control(ANC) becomes efficiently an available tool for the noise suppression with rapid advances of solid state electronics. In this study an ANC system is developed for audio headphone to work as a noise protector, so called an ear-muff. The system is developed to kill a certain frequency band noises selectively which is purposed to suppress only the dominant ambient noise such that normal numan conversation is not disturbed with wearing the ear-muff. For the purpose, an ANC design strategy is suggested and implemented with an analogue control circuit. The performance is evaluated by frequency response test, which shows well consistence with theoretical one. The results are so satisfactory that noise of 640 Hz, which is aimed to suppress, is reduced by 20db without significant distortion in other frequency band.

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