线性正则正弦与余弦变换的卷积定理及其应用

Convolution theorems for the linear canonical sine and cosine transform and its application

针对奇、偶信号的去噪问题,提出了一种基于线性正则正(余)弦变换卷积定理的乘性滤波器设计方法。在现有线性正则变换域卷积理论的基础上,研究了两类线性正则正(余)弦变换卷积定理,利用所得卷积定理,通过合理选择滤波函数,设计了一类基于卷积定理的线性正则正(余)弦变换域带限信号的乘性滤波模型,并对算法的复杂度进行分析。研究表明,这种滤波模型特别适合处理奇、偶信号,并能有效降低乘积滤波的计算复杂度,提高运算效率。

For the denoising problem of odd and even signals, a multiplicative filter design method based on the convolution theorem of the linear canonical sine and cosine transform is proposed. Two kinds of convolution theorems associated with the linear canonical sine and cosine transform based on the existing linear canonical transform domain convolution theory are derived. Using this two convolution theorems, two kinds of the multiplicative filtering models of the band-limited signal are designed by choosing an appropriate filter function in linear canonical sine and cosine transform domain. And the complexity of these schemes is analyzed. The results indicate that these filtering models are particularly suitable for handling odd and even signals, and can effectively improve computational efficiency by reducing computational complexity.