对某某函数进行傅里叶变换 英语怎么说？

conduct fourier transformation on function XXX

简单地说：
the DTFT of the XX
给一段外文教材给你，你就知道了
This equation suggests that the DTFT of the filter output may be calculated from the frequency response and the DTFT of the input as follows:

不过这个是指离散时间傅里叶变换，但是语法是一样的。