| Parametric adaptive time-frequency representation based on time-sheared Gabor atoms |
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| 作者单位： | School of Mechatronical Engineering &; Automation，Shanghai Key Lab of Power Station Automation Technology, Shanghai Univ., Shanghai 200072, P. R. China |
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| 基金项目： | 国家自然科学基金;上海市重点学科建设项目 |
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| 摘 要： | A localized parametric time-sheared Gabor atom is derived by convolving a linear frequency modulated factor, modulating in frequency and translating in time to a dilated Gaussian function, which is the generalization of Gabor atom and is more delicate for matching most of the signals encountered in practice, especially for those having frequency dispersion characteristics. The time-frequency distribution of this atom concentrates in its time center and frequency center along energy curve, with the curve being oblique to a certain extent along the time axis. A novel parametric adaptive time-frequency distribution based on a set of the derived atoms is then proposed using a adaptive signal subspace decomposition method in frequency domain, which is non-negative time-frequency energy distribution and free of cross-term interference for multicomponent signals. The results of numerical simulation manifest the effectiveness of the approach in time-frequency representation and signal de-noising processing.
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| 关 键 词： | 参数自适应时频表示法 时间切变 Gabor原子 时频分析 自适应信号分解 |
| 收稿时间： | 2 August 2005. |
Parametric adaptive time-frequency representation based on time-sheared Gabor atoms |
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| Authors: | Ma Shiwei Zhu Xiaojin Chen Guanghua Wang Jian Cao Jialin |
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| Institution: | School of Mechatronical Engineering & Automation, Shanghai Key Lab of Power Station Automation Technology, Shanghai Univ., Shanghai 200072, P. R. China |
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| Abstract: | A localized parametric time-sheared Gabor atom is derived by convolving a linear frequency modulated factor, modulating in frequency and translating in time to a dilated Gaussian function, which is the generalization of Gabor atom and is more delicate for matching most of the signals encountered in practice, especially for those having frequency dispersion characteristics. The time-frequency distribution of this atom concentrates in its time center and frequency center along energy curve, with the curve being oblique to a certain extent along the time axis. A novel parametric adaptive time-frequency distribution based on a set of the derived atoms is then proposed using a adaptive signal subspace decomposition method in frequency domain, which is non-negative time-frequency energy distribution and free of cross-term interference for multicomponent signals. The results of numerical simulation manifest the effectiveness of the approach in time-frequency representation and signal de-noising processing. |
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| Keywords: | Time-frequency analysis Gabor atom Time-shear Adaptive signal decomposition Time-frequency distribution |
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