A generalized convolution theorem for the special affine Fourier transform and its application to filtering

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• 作者：Xiyang Zhi^a ; ^{zhixiyang@hit.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Deyun Wei^b ; ^{dywei@xidian.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Wei Zhang^a ; ^{wzhang6262@hit.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Special affine Fourier transform ; Convolution and product theorem ; Filtering
• 刊名：Optik - International Journal for Light and Electron Optics
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：127
• 期：5
• 页码：2613-2616
• 全文大小：417 K

文摘

The special affine Fourier transform (SAFT), which is a time-shifted and frequency-modulated version of the linear canonical transform (LCT), has been shown to be a powerful tool for signal processing and optics. Many properties for this transform are already known, but an extension of convolution theorem of Fourier transform (FT) is still not having a widely accepted closed form expression. The purpose of this paper is to introduce a new convolution structure for the SAFT that preserves the convolution theorem for the FT, which states that the FT of the convolution of two functions is the product of their Fourier transforms. Moreover, some of well-known results about the convolution theorem in FT domain, fractional Fourier transform (FRFT) domain, LCT domain are shown to be special cases of our achieved results. Last, as an application, utilizing the new convolution theorem, we investigate the multiplicative filter in the SAFT domain. The new convolution structure is easy to implement in the designing of filters.