‍在变换区间<img src="https://static.zxtiku.com/wangke/imgs/topic/a2d0575f057cdd5a4e4f54cff2f096f8.png"/>内，序列<img src="https://static.zxtiku.com/wangke/imgs/topic/779e12af32875611fcc1892d7def2240.png"/>的N点离散傅立叶变换为（）‏