DIRECTIVE HARMONIC WAVE DETECTING SYSTEM USING LINEAR MICROPHONE ARRAY

직선배열 Microphone에 의한 음원의 방향과 주파수의 분석 System

  • CHANG J. (Dept. of Communication Engineering, National Fisheries University of Busan) ;
  • ABE M. (Research Center for Applied Information Sciences, Tohoku University) ;
  • KIM C. (Dept. of Communication Engineering, National Fisheries University of Busan) ;
  • KIDO K. (Research Center for Applied Information Sciences, Tohoku University)
  • 장지원 (부산수산대학 통신공학과) ;
  • 안배정인 (동북대학 응용정보학연구센터) ;
  • 김천덕 (부산수산대학 통신공학과) ;
  • 성호건일 (동북대학 응용정보학연구센터)
  • Published : 1980.12.01

Abstract

Various methods have been so far proposed to find out the directions and spectra of sound waves from the sources for provisions of noise controls. The conventional methods are generally classified into three systems such as, single microphone system, moving microphone system and multi-microphone system, which composes a resultant super directivity by giving a appropriate delay and a weighting coefficient in the output of each microphone. In case of using a single microphone there is a difficulty in providing it with desirable super directivity in the low frequency range, while in case of using multi-microphone system there has been a disadvantage that the measurement of directivity could not separately be done with the spectrum analysing. And in case of the use of a moving microphone system it needs a condition that the sound source to be detected should be stationary state and in rest. However here we introduce a method that the spectral analysing and the directivity of synthesis can be separately carried out by using a linear array of many microphones, in which each output of the microphone is multiplied by appropriate weighting coefficient and all of those products are summed after passing through adequate filters. The resultant signal is then sampled with an adequate sampling frequency and taken average for processing.

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