求图所示[tex=2.071x1.357]RoALMyfG9SmCdLviZqkXVg==[/tex]的傅里叶逆变换[tex=1.643x1.357]Wfem9oxh0ZS7nZ3KGomKoQ==[/tex]。[img=303x165]17a5b044331f898.png[/img][img=281x153]17a5b0e8b5af64b.png[/img]
举一反三
- 求图所示[tex=2.071x1.357]RoALMyfG9SmCdLviZqkXVg==[/tex]的傅里叶逆变换[tex=1.643x1.357]Wfem9oxh0ZS7nZ3KGomKoQ==[/tex]。[img=287x159]17a5b023a06275c.png[/img][img=294x148]17a5b0e14b5afd3.png[/img]
- 求图所示 [tex=2.071x1.357]tibrCRwNLzDQQYea733HmQ==[/tex] 的傅里叶逆变换 [tex=1.643x1.357]Wfem9oxh0ZS7nZ3KGomKoQ==[/tex][img=409x217]17a45fa3efa5834.png[/img]
- 设信号[tex=1.643x1.357]Wfem9oxh0ZS7nZ3KGomKoQ==[/tex]的频谱 [tex=2.071x1.357]tibrCRwNLzDQQYea733HmQ==[/tex] 如图 (a)所示, 当该信号通过图(b)系统后, 证明 [tex=1.643x1.357]OiyUjvaNKwAtwHxCTVl2yg==[/tex] 恢复为 [tex=1.643x1.357]Wfem9oxh0ZS7nZ3KGomKoQ==[/tex] 。[img=891x270]17d4bb2b90fcfc0.png[/img]
- 求图所示信号[tex=1.643x1.357]QEos0FZVoxidwAY2Qi/JJQ==[/tex]的频谱函数[tex=2.071x1.357]IVBnoG/ZLtJA1HKOoFX6Lw==[/tex]。[img=280x214]17a484dec4d23f7.png[/img]
- 表示x是5的倍数或是9的倍数的逻辑表达式为 ____。 A: x \ 5 = 0 Or x \ 9 = 0 B: x \ 5 = 0 And x \ 9 = 0 C: x Mod 5 = 0 Or x Mod 9 = 0 D: x Mod 5 = 0 And x Mod 9 = 0