Predictive vector quantization

A proposed class of vector quantizers with memory, called Predictive Vector Quantizers (PVQ), exhibits good performance (as measured by mean-squared error distortion) for the encoding of speech signals at 16 kbits/sec. Two methods for designing PVQ´s are described, and their performance is compared to that of memoryless VQ´s by computer simulation. These results indicate that, for comparable performance, the PVQ has a smaller block size and computational load than the memoryless VQ. In addition, preliminary simulations indicate that PVQ´s are less speaker dependent than memoryless vector quantizers.