已知某因果连续时间LTI系统，其频率响应为，对于某一输入信号所得输出信号的傅里叶变换为，则该系统的输入（ ）https://image.zhihuishu.com/zhs/doctrans/docx2html/202002/371e38556000448899d362fe6ce66585.png
举一反三
- 已知某因果连续时间LTI系统，其频率响应为，对于某一输入信号x（t）所得输出信号的傅里叶变换为，则该系统的输入x（t）=（） A: B: C: D:
- 已知某系统的系统函数为<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202002/61983fc0e7e24edca688b5811738d128.png" >，唯一决定该系统单位冲激响应<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202002/d414273f7b4e4c059b98fb161abbaf1f.png" >函数形式的是（）。 A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202002/61983fc0e7e24edca688b5811738d128.png" >的零点 B: 系统的输入信号与<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202002/61983fc0e7e24edca688b5811738d128.png" >的极点 C: 系统的输入信号 D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202002/61983fc0e7e24edca688b5811738d128.png" >的极点
- 已知信号<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202002/82c317e53c6941b59567bc236a6ec9ba.png" >，则奈奎斯特取样频率fs为()。 A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202002/7f3cd88d635b4fe0871233447ea5494b.png" > B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202002/53752d34e4c64504bc111e280262e228.png" > C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202002/50d5151b1d3f406185372b2ac9f19f93.png" > D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202002/ad47ea06d5aa4270a8e0089425f0bf6d.png" >
- 已知Z变换Z<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202002/94487389db974f98b2d38b947ec20d83.png" >，收敛域<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202002/56b4868c286b4b48a8cec67f9f766670.png" >，则逆变换x（n）为()。 A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202002/547656863c8b459da97c366d9321ef13.png" > B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202002/d3572493bf964e2d92fde49d59b632af.png" > C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202002/c4aacba69e0445b0ad4db797b3c86d53.png" > D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202002/b9af7d9dccb3446595a3a587492eb92a.png" >
- 已知某信号的拉氏变换<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/ec06694fc49c4bf5a6ba0fd2e2da191e.png" />，则该信号的时间函数为（ ） A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/a0dfe38fe649447eaaa5fc249a132257.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/2c337c663bbb4715bbbda2710aed8308.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/1f910feb02c34764a8351b1bef10280e.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202011/d2db9dcb8c7847698298ad42ed6e3f0d.png" />