The SkyV2 format is a personal project that was started in 2005. The main goal was
to use the FFT in order to compress music with ratios between 5 and 11 and with
a reasonnable audio quality, like the MP3 format (which uses MDCT instead of FFT).
Unfortunately, the quality is not as good as the MP3 format. But for a format implemented in Java language in just a few months and readable in real-time, I think it is quite acceptable anyway ! The SkyV2 uses some technologies employed by the MP3 format, like windowing, joint-stereo, frequency-band scale factor, frequency-band quantization, and naturally binary storage.
This project ended in late 2005.
You can download the Setup (38.4 MB) and some SkyV2 examples (49.6 MB).