Localization of window functions of dual and tight gabor frames generated by the Gaussian function
- 作者: Kiselev E.A.1, Minin L.A.1, Novikov I.Y.1, Ushakov S.N.1
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隶属关系:
- Voronezh State University
- 期: 卷 215, 编号 3 (2024)
- 页面: 80-99
- 栏目: Articles
- URL: https://journals.rcsi.science/0368-8666/article/view/254274
- DOI: https://doi.org/10.4213/sm9957
- ID: 254274
如何引用文章
详细
Gabor frames generated by the Gaussian function are considered. The localization of the window functions of dual frames is estimated in terms of the uncertainty constants, it its dependence on the relation between the parameters of the time-frequency window and the degree of overcompleteness. It is shown that localization worsens rapidly with the increasing disproportion in the parameters of the window. On the other hand, the higher the system of functions forming the frame is overdetermined, the better the window function of the dual frame is localized. For a tight frame the localization of the window function with the same set of parameters is much better than that for the dual frame. This problem is closely related to the problem of interpolation by we have uniform shifts of the Gaussian function. Both the nodal interpolation function and the window function of the dual frame are constructed from the same coefficients. These coefficients play an important role also in the derivation of formulae for the uncertainty constants. This is why their properties related to sign alternation and the monotonicity of decrease of the absolute value are considered in the paper.
作者简介
Evgenii Kiselev
Voronezh State University
Email: evg-kisel2006@yandex.ru
Candidate of physico-mathematical sciences, no status
Leonid Minin
Voronezh State University
Email: mininla@mail.ru
Igor Novikov
Voronezh State University
编辑信件的主要联系方式.
Email: evg-kisel2006@yandex.ru
Doctor of physico-mathematical sciences, Professor
Sergei Ushakov
Voronezh State University
Email: ushakowww@ya.ru
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