Study of Predictive Vector Quantizers for Speech Coding

Abstract

This paper deals with the application of predictive vector quantization (PVQ) techniques for coding of speech signals at low bit rates. Memoryless vector quantizer (VQ) has also been studied for comparison, Computer aided design of VQ and PVQ systems has been done using the algorithms presented in the literature. The results obtained using computer simulation for coding of sampled speech have been presented and discussed. A comparison between various PVQ design algorithms has been carried out. It is concluded that PVQ system results in significant improvement in signal to quantization noise ratio over memoryless VQ. Steepest Descent Algorithm for PVQ design is easier to use in practice and yields consistent results.