is there a mircophone input demo

i am testing a function about audio input from microphone. i have found some articles from this hub .but all of them talk is not very clear. the most clear should be this link:, but it has two includes that i do not find. so i desire get a demo about microphone .
there is another friend tell me go to forum to ask this. but i have a try and sorry for I can’t find where is my submit,