Right to the point:
I want a USB microphone in the $8 to $800 range with a very flat frequency response in the 20 Hz to 20 kHz range, and I want to use LabVIEW to analyze its data.
I can easily figure out how to do this in LabVIEW, but what are some good microphone choices for this where the manufacturer shows me a graph of its frequency response?
Possibly too many unrelated details:
I'm buying gold coins and I want to tell what percentage gold they are so I don't get duped by counterfeits. Currently I measure the coins with a micrometer, weigh them very accurately, and do image processing on them; but I want to take it a step further.... When I flip a pure gold coin in the air (e.g. Canadian Maple or Austrian Philharmonic), it has a nice ring to it. When I flip an impure gold coin in the air (e.g. American Eagle or South African Krugerrand), it has a different ring. I want LabVIEW and its signal processing functions to do the same thing my ears do.