RISS 학술연구정보서비스

검색
다국어 입력

http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.

변환된 중국어를 복사하여 사용하시면 됩니다.

예시)
  • 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
  • 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
닫기
    인기검색어 순위 펼치기

    RISS 인기검색어

      검색결과 좁혀 보기

      선택해제

      오늘 본 자료

      • 오늘 본 자료가 없습니다.
      더보기
      • 무료
      • 기관 내 무료
      • 유료
      • Study on the Denoising Processing of Ultrasonic Testing Signal for Standing Trees Based on Wavelet Transform

        Wenshu Lin,Haokai Xu,Jinzhuo Wu 보안공학연구지원센터 2016 International Journal of Signal Processing, Image Vol.9 No.1

        To remove the impact of noise on the ultrasonic testing signals of standing trees, wavelet transform method was used to eliminate the noise in the collected ultrasonic signals in the field. In order to achieve the best denoising effect, four kinds of wavelet base denoising parameters including Daubechies (db), Symlets (sym), Coiflets (coif), and Discrete Meyer (dmey) were compared, and the best denoising effect was obtained with db3 wavelet base. The variations of denoising parameters corresponding to the number of db3 wavelet decomposition levels (1- 8) were further analyzed and the decomposition level 4 was demonstrated the best. Meanwhile, the effects of wavelet denoising under different threshold states were compared and the hard rigrsure threshold was demonstrated the best. Experimental results showed that the wavelet transform can effectively remove noise hidden in the ultrasonic signal and improve the denoising effect by selecting reasonable parameters, which laid some initial groundwork for efficient extraction of useful information from the ultrasonic signals.

      연관 검색어 추천

      이 검색어로 많이 본 자료

      활용도 높은 자료

      해외이동버튼