Get the waveform of the microphone input sound in C #

How to get the frequency of sound fluctuations, to find some information on the Internet:

DirectSound of DirectX

Http://zhidao.baidu.com/question/448587955.html

Http://www.cnblogs.com/stg609/category/158848.html

http://download.csdn.net/download/trbbadboy/4368201

(information as above, specifically I do not understand, haha.) ）

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Draw Curve in real time C # waveform curve rendering

An open source project for drawing sound waveforms that can be used for real-time plotting of waveform curves.

Http://www.codesoso.com/code/Curve_RealTime.aspx

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The following is a discussion of the forum, you can look at all the answers and the solutions given

http://bbs.csdn.net/topics/300126667

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Project Examples:

Http://wenku.baidu.com/view/56519645b307e87101f69675.html

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The following gives an open source project:

http://www.dreamincode.net/forums/topic/38890-activex-with-c%23/

Http://www.codeproject.com/Articles/15328/C-Voice-and-Tone-Alert-Generator

Get the waveform of the microphone input sound in C #