Microphone Input Detection

I would like to create a VI that actively detects if there is a signal present on the microphone input of my sound card. I don't care to extract any information from the signal other than if it is above a certain threshold I set. My vision is that I can see a virtual LED light up when I speak into the mic and it will turn off when I stop talking. I would also like to record the "mute" events (start and stop points) with a timestamp relative to start of the aquisition.
Any help would be greatly appreciated.
Thanks!

Hi Jennifer,
I've used similar VI's available in the examples (Sound2) of Lab view folder and developed few VI's.
Please see the attached below.
The problem i'm facing is I coudlnt initiate the record option automatically.(manually starting the VI and stopping the VI- need to be autoamted)
And even the recorded 1.wav is not similar to the library wave file available with me..
Play the library wave file attached here with...
Looks like some problem with the sound format..
Please give a proper suggestion as to how to make these two .wav formats equal...
if these two formats are equal, i already designed a comparison technique which will compare two .wav files and gives the result as pass/fail..
Thanks in Advance.
Cheers,
Suneel.V
Attachments:
My_proj.zip ‏185 KB

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