Adaptive multistage vector quantization

The authors present a novel multiple-stage vector-quantization method that allows the adaptation of the quantizer to the signal to be coded. This adaptation is computationally very simple and is made with no increase in bit rate. The resulting quantizer provides a robust performance across different speakers and environments. It has been applied to the quantization of the LPC parameters, and the results show a significant increase in performance compared to conventional multistage vector quantizers