一阶巴特沃思低通滤波器的上限截止频率为：https://edu-image.nosdn.127.net/B28DBD6D5D0D54AA04F58498C0E30F43.png?imageView&thumbnail=890x0&quality=100
举一反三
- 有源滤波器（一阶巴特沃思低通滤波器）的幅频特性曲线是？https://edu-image.nosdn.127.net/2FE91AC79FED0E6A1F650BBEC039F7A2.png?imageView&thumbnail=890x0&quality=100
- 一阶低通和高通滤波电路的特征频率http://edu-image.nosdn.127.net/7E7F1055858242AC1846E34707EA3848.png?imageView&thumbnail=890x0&quality=100与通带截止频率http://edu-image.nosdn.127.net/5EC1781C90A066C15C4A6AFF6EF983C2.png?imageView&thumbnail=890x0&quality=100相等；而高阶低通和滤波电路的http://edu-image.nosdn.127.net/3ED720FB1F05ABA1F9079DE5B7F791B8.png?imageView&thumbnail=890x0&quality=100http://edu-image.nosdn.127.net/F711F7FB9E8D3C851ACAABB02F5C6EE7.png?imageView&thumbnail=890x0&quality=100http://edu-image.nosdn.127.net/865F0785FF3D04AFFC7A9E21B34598FD.png?imageView&thumbnail=890x0&quality=100。
- ∫(上限0,下限-a)f(x)=－∫（上限0,下限a）f(x)吗?
- 中国大学MOOC: 设某线性电路的单位冲激响应为https://edu-image.nosdn.127.net/42740C7A893EA027EAD1C3A530168119.png?imageView&thumbnail=890x0&quality=100，https://edu-image.nosdn.127.net/CADBA465555ED9687047E00106605E87.png?imageView&thumbnail=890x0&quality=100为输入，则https://edu-image.nosdn.127.net/7DBA57BE4DE0D6ECEEDFBE27B38EBAA7.png?imageView&thumbnail=890x0&quality=100是系统的（ ）响应。
- 设f(x)可导，且F(x)=f(x)(1+｜sinx｜)在x=0处可导，则( )． A: f(0)=0 B: f"(0)=0 C: f(0)=f"(0) D: f(0)=一f"(0)