Multi-dimensional quantization applied to predictive coding of speech
Torbjørn Karl Svendsen · 2005
The properties of several multi-dimensional quantizers (VQ, tree and trellis coders) have been investigated. The multi-dimensional quantizers yield a superior distortion performance for direct quantization of stationary sources. Incorporated in a predictive speech coding scheme, NFC, the use of multi-dimensional quantizers improves speech quality noticably. A subjective test indicate that NFC with trellis coding is a promising candidate for speech coding at 16 kbit/s.