지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
초록· 키워드
오류제보하기
Vibration-based Structural Health Monitoring (SHM) systems use field measurements of operational signals, which are distorted by noise from many sources. Reducing this noise allows a more accurate assessment of the original "clean" signal and improves analysis results. The implementation of a noise reduction methodology for the Modal Distribution Method (MDM) is reported here. The spectral subtraction method is a popular broadband noise reduction technique used in speech signal processing. Its basic principle is to subtract the magnitude of the noise from the total noisy signal in the frequency domain. The underlying assumption of the method is that noise is additive and uncorrelated with the signal. In speech signal processing, noise can be measured when there is no signal. In the MDM, however, the magnitude of the noise profile can be estimated only from the magnitude of the Power Spectral Density (PSD) at higher frequencies than the frequency range of the true signal associated with structural vibrations under the additional assumption of white noise. The implementation of the spectral subtraction method to MDM may decrease the energy of the individual mode. In this work, a modification of the spectral subtraction method is introduced that enables the conservation of the energies of individual modes. The main difference is that any (negative) bars with a height below zero after subtraction are set to the absolute value of their height. Both noise reduction methods are implemented in the MDM, and an application example is presented that demonstrates its effectiveness when used with a signal corrupted by noise.
목차
ABSTRACT
1. Introduction
2. Methodology
3. Example
4. Conclusion
References
참고문헌 (8)
참고문헌 신청
1. [학술지(정기간행물)] - Berouti, M / 1979 / Enhancement of Speech Corrupted by Acoustic Noise / Proceeding of IEEE International Conference on Acoustics, Speech, and Signal Processing 4 : 208 ~ 211
2. [학술지(정기간행물)] - Boll, S / 1979 / Suppression of Acoustic Noise in Speech Using Spectral Subtraction / IEEE Transactions on Acoustics, Speech and Signal Processing 27 : 113 ~ 120
3. [학위논문] - Choi, M / 2009 / The Modal Distribution Method: A New Statistical Algorithm for Analyzing Measured Response / PhD / Texas A&M University.
4. [단행본] - Godsill, S.H / 1998 / Digital Audio Restoration: A Statistical Model Based Approach, Secaucus / Springer-Verlag Inc
5. [단행본] - Loizou, P.C / 2007 / Speech Enhancement: Theory and Practice / CRC Press
2. [학술지(정기간행물)] - Boll, S / 1979 / Suppression of Acoustic Noise in Speech Using Spectral Subtraction / IEEE Transactions on Acoustics, Speech and Signal Processing 27 : 113 ~ 120
3. [학위논문] - Choi, M / 2009 / The Modal Distribution Method: A New Statistical Algorithm for Analyzing Measured Response / PhD / Texas A&M University.
4. [단행본] - Godsill, S.H / 1998 / Digital Audio Restoration: A Statistical Model Based Approach, Secaucus / Springer-Verlag Inc
5. [단행본] - Loizou, P.C / 2007 / Speech Enhancement: Theory and Practice / CRC Press
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UCI(KEPA) : I410-ECN-0101-2012-559-004502608