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。
举一反三
- http://edu-image.nosdn.127.net/EC9D7EA61F1EFFB86E66B5E0259BCBBD.png?imageView&thumbnail=890x0&quality=100http://edu-image.nosdn.127.net/13F84D3AF06E795D4BF13D9C8B0AD44F.png?imageView&thumbnail=890x0&quality=100
- 中国大学MOOC: http://edu-image.nosdn.127.net/8E989C885179CAD3E88F4ED14999CEF9.jpg?imageView&thumbnail=890x0&quality=100http://edu-image.nosdn.127.net/270D935AC13F8AC30775CB323882970C.jpg?imageView&thumbnail=890x0&quality=100http://edu-image.nosdn.127.net/E8F4932FC8C534FE91D7CCBE9744E7AD.jpg?imageView&thumbnail=890x0&quality=100
- 中国大学MOOC: http://edu-image.nosdn.127.net/8E989C885179CAD3E88F4ED14999CEF9.jpg?imageView&thumbnail=890x0&quality=100http://edu-image.nosdn.127.net/270D935AC13F8AC30775CB323882970C.jpg?imageView&thumbnail=890x0&quality=100
- 中国大学MOOC: http://edu-image.nosdn.127.net/7D51EA94B193D097167CC61B91F23395.png?imageView&thumbnail=890x0&quality=100http://edu-image.nosdn.127.net/46BE8EC842C20D2566C34496757F7637.png?imageView&thumbnail=890x0&quality=100
- 中国大学MOOC: 下图中，若http://edu-image.nosdn.127.net/3CC508F9AB3640FC7B4FC8A56BCC3C4A.png?imageView&thumbnail=890x0&quality=100，http://edu-image.nosdn.127.net/1E98E4093ED9A9CF99D5410CB4F9E5FC.png?imageView&thumbnail=890x0&quality=1000011，求http://edu-image.nosdn.127.net/C431073D6B6C788B674E11D5E7EA9B8F.png?imageView&thumbnail=890x0&quality=100（ ）。http://edu-image.nosdn.127.net/3F2606B33B97941F5DFADC9F32BD58AD.png?imageView&thumbnail=890x0&quality=100