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Is it possible to record audio only when there is someone talking? I want to listen to the microphone and only start recording when the “volume” is greater than some noise level (meaning someone is talking) I also need to change the pitch of the recorded audio.
I tried MediaCapture class in C# but StartRecordToStorageFileAsync from a sample is not useable in my scenario. In Windows Phone I use XNA but I cannot find a similiar API in Windows 8.
Check this thread on MSDN forums: How to get the decibel with C#?
It seems like there is and probably will not be APIs for doing that in C#, Visual Basic or JavaScript and you need to do it in a native component.
The Core Audio/WASAPI APIs from the article mentioned in that thread should have what you need: Win32 and COM for Metro style apps (multimedia)
I think this document has a description of a sample for capturing audio from a Kinect sensor that might have relevant code samples showing how you would use GetBuffer() calls to get the buffer of raw audio samples that you could process to get the information you need.