Journal
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
Volume 71, Issue -, Pages -Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIM.2022.3187742
Keywords
Vibrations; Estimation; Robustness; Colored noise; Background noise; White noise; Standardization; Nonwhite noise; spectral peaks; trimmed data; truncated gamma distribution; vibration; acoustic signals
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This article presents a practical solution to the problem of detecting spectral peaks in nonuniform spectra. A robust probabilistic approach is applied, where the histogram of trimmed spectral data is fitted with a truncated Gamma distribution. The estimated distribution parameters are used to derive a threshold through a hypothesis test. The proposed approach is robust as it formulates the distribution without peaks, regardless of the number of peaks in the spectral data. The authors also suggest a preprocessing step to handle nonuniform spectra, and the methodology is validated using simulated and experimental signals.
This article brings a practical solution to the problem of spectral peak detection in nonuniform spectra. It applies a robust probabilistic approach that fits the histogram of trimmed spectral data with a truncated Gamma distribution. The estimated distribution parameters are used to derive a threshold through a hypothesis test in the presence of peaks. The proposed approach gains its robustness from the formulation of the no-peak distribution, while no knowledge is available about the amount of peaks in spectral data. The authors propose a preprocessing step to cope with a nonuniform spectrum. The proposed methodology is validated on both simulated and experimental vibration and acoustic signals.
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