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Getting freqeuncy of an external input

Posted on 2003-10-24
Medium Priority
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Hi,

how can i get the frequeny of an external input (like a guitar)?
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Question by:duke2000
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Accepted Solution

davidhusselmann earned 500 total points
ID: 9622037
Hi,

This is potentially a very hard problem.  The algorithm you use for this is the Fast Fourier Transform (or FFT) - but usually the sound from musical instruments such as the guitar consist of many frequencies (called harmonics), so you'll end up with a jumbled mess of frequencies out the other end of the FFT.  You'll have to find out which frequency you need and filter the rest out.

There are many FFT components available for Delphi online.  You'll find one of them here: http://teachme.tuwien.ac.at/lo/fourier.html

Good luck
David
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