These are my experiments into Fourier Transforms and Threading. My ultimate goal with this is to be able to recognise whistled melodies. Speech recognition by whistling instead of speaking. Should be much more reliable, I thought.

The general idea is this: record signal, FFT it, then grab the most intense frequency.

There are currently three (testing) programs:

• fft-test reads a file using libsndfile, runs an FFT over it and displays the frequencies.
• fft-record records 3 seconds of sound using Portaudio, runs an FFT over it and displays the frequencies.
• fft-thread is the most complex: it records continually and does the FFT'ing and displaying in a separate thread.

All the programs compile with GCC-4.8.1 under MinGW-32 on Windows 7. I use Dr. Memory to check for memory-mistakes.

• fft-test uses libsndfile (http://www.mega-nerd.com/libsndfile/)
• fft-record and fft-thread use PortAudio (http://portaudio.com/)
• fft-thread uses Pthread(-w32) (http://www.sourceware.org/pthreads-win32/)

They all use FFTW 3 (http://fftw.org/)

The license is a modified zlib license. I include no copyright notices in source files since it's not legally necessary ('all rights reserved' is the default copyright on every work, so noting it is redundant and deprecated). See LICENSE for details. Basically I added a clause that includes NOTICE-files in this and any derived work.

It is my understanding that this license is compatible with the licenses that the dependencies use. If anyone believes otherwise let them speak (now) or.. later.