| Full text | |
| Author(s): |
Total Authors: 2
|
| Affiliation: | [1] Mectron Engn Ind & Comercio SA, Sao Jose Dos Campos, SP - Brazil
[2] Inst Tecnol Aeronaut, Div Engn Eletron, Sao Jose Dos Campos, SP - Brazil
Total Affiliations: 2
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| Document type: | Journal article |
| Source: | DIGITAL SIGNAL PROCESSING; v. 22, n. 4, p. 622-627, JUL 2012. |
| Web of Science Citations: | 9 |
| Abstract | |
This paper proposes an optimization-based method to design orthonormal wavelet filters with improved frequency separation. The proposed approach adopts a parameterization of orthogonal filter banks which ensures that the resulting wavelets have at least two vanishing moments. The filter parameters are adjusted by a numerical optimization algorithm in order to minimize a cost function associated to cut-off sharpness. In comparison with standard orthonormal filters, the proposed method is shown to provide better trade-off between frequency selectivity and time resolution. For illustration, the optimized filters are employed in an application example involving the use of a wavelet-packet system identification scheme. As a result, the identification errors are smaller than those obtained by using a non-optimized filter with the same length. (C) 2012 Elsevier Inc. All rights reserved. (AU) | |
| FAPESP's process: | 06/58850-6 - Diagnosis, prognosis and fault accommodation for dynamical systems |
| Grantee: | Takashi Yoneyama |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 11/17610-0 - Monitoring and control of dynamic systems subject to faults |
| Grantee: | Roberto Kawakami Harrop Galvão |
| Support Opportunities: | Research Projects - Thematic Grants |