Journal of KSNVE (소음진동)

The Korean Society for Noise and Vibration Engineering (한국소음진동공학회)
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A tudy on the TV Microphonic Phenomenon

TV 마이크로포닉 현상에 관한 연구

  • 성길주 (중앙대학고 대학원, 기계공학과) ;
  • 윤경렬 (아주대학교 대학원 기계공학과) ;
  • 이재응 (중앙대학교 공과대학 기계공학과) ;
  • 이수훈 (아주대학교 공과대학 생산자동차공학과) ;
  • 임진수 (아주대학교 공과대학 기계공학과)
  • Published : 1995.03.01
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Abstract

The microphonic phenomenon in TV(television) is a phenomenon that a stained pattern locally appears in the screen or moves like waves. This can be observed when audio signal of TV has specific frequencies under loud volume of sound. In this study, microphonic phenomenon has been investigated, and two practical ways of circumventing this has been proposed. Based on modal analysis of several TV parts(Cathod Ray Tube, shadowmask, etc.), it was proved that the microphonic phenomenon is caused by the resonance of the shadow mask. One of the proposed ways to circumvent this phenonenon is increasing the thickness of the frame, the other is removing the middle welding points between the frame and the shadow mask. The effects of these modifications are evaluated by the finite element analysis, and the results show that the magnitude of vibration of shadow mask reduced by 10 - 20dB, which is large enough to provent microphonic phenomenon even under maximum level of sound volume.

Keywords

References

  1. Basic Television and Video System Bernard Grob
  2. I-DEAS System Dynamics User's guide
  3. Modal Testing:Theory and Practice D.J.Ewins
  4. 한국정밀공학회지 새도우매스크진동에 의한 TV 마이크로포닉 현상 시뮬레이션 임진수;이수훈;이재웅