How to implement microphone detecting??

Hi all,
I've seen some iPhone apps can detect the strength or the direction when user blow to microphone.
Dose anyone know where I can find a description about how to implement this feature, I'll deeply appreciate your help.

I've read audio session, but can't find anything about how to implement detecting strength or direction when user blowing to microphone.
Can you tell me where exactly the details about this technology can be found? Thanks.^^"

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