TwinVQ

• FOURCCs: Unknown
• Company: Nippon TT

Perceptual audio codec. The main technique used is a vector quantizer. The codebook is about 500kb is size, this results in long encoding times but fast decoding.

http://www.webisdead.net/DOWNLOADS/-programmes/vqf/ has a SDK for Windows and Linux on the x86 platform.

http://www.mp3-tech.org/programmer/sources/refsoft990809.tgz also have code for the vqf version that made it into AAC.