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Perceptual audio codec. The main technique used is a vector quantizer. The codebook is about 500kb in size, this results in long encoding times but fast decoding. has the official encoder and player for Windows. has code for the vqf version that made it into AAC. Intel shares some code for AAC flavored vqf. hosts several encoders and decoders. It includes NTT's binary-only encoding and decoding libraries and C++ header files.