QuiFFT is a library that makes
FFT computation in Java incredibly easy.

See the docs
Code examples

QuiFFT abstracts away the technical details of digital audio representation and wave mathematics, providing a delightfully simple interface for computing Fourier transforms in Java.

Your first FFT can be as simple as one line: FFTResult fft = new QuiFFT("audio.mp3").fullFFT();

When you give QuiFFT an audio file it will split its signal into discrete sampling windows according to configurable parameters, then compute a Fourier transform for each of these windows, returning the result.

Ready to get started? Add QuiFFT to your Maven project: <dependency>
<groupId>org.quifft</groupId>
<artifactId>quifft</artifactId>
<version>0.1.1</version>
 </dependency>

QuiFFT’s source code and documentation is available on Github. To get a better sense for how QuiFFT works, you can also check out the JavaDoc.