Speech coding method using fuzzy vector quantization

A medium-based, high-quality speech coding method that is promising for producing high-quality speech is proposed. One of its main features is the application of a PSE (power-spectrum envelope) analysis method. Another feature is the application of fuzzy vector quantization (FVQ), which can reduce quantization distortion to below that of conventional VQ. Reduced FVQ (R-FVQ), which uses a k-nearest-neighbor technique, a code-word selection technique, and a predetermined table, is proposed for reducing both the bit rate and quantization distortion. Using R-FVQ, speech was coded at 8-kb/s and the synthetic speech was of high quality and sounded natural