FFT digital audio

Question

I am using NAudio library for C#. I have a bye array of floating points from a .wav file. I would like put this through a FFT so I can find if a song has certain frequencies. For example a frequency which of a flute etc. Is there an FFT in NAudio and if so what does it take and output?

Answer 1

Here's a SO question which explains how to calculate FFT in NAudio .

Personally, I haven't been the biggest fan of NAudio for FFT implementations, I would rather use the following open-source solutions:

AForge.net . View the ComplexImage.cs for usage & FourierTransform.cs for implementation.

Math.NET's Iridium library (licensed under the LGPL so you are free to use it in commercial products).

Chris Lomont's C# Fast Fourier Transform .

MSDN also has a great discussion and a sample FFT implementation .