Abstract
A computationally efficient stochastic vector quantization (VQ) scheme for the quantization of LPC parameters with less than 25 bits is proposed. The complexity of the self-excited vocoder (SEV) is reduced by using fast algorithms based on an efficient representation of the innovation sequence. When the suggested VQ scheme is deployed in the improved SEV, good communications speech quality is obtained at 4.8 kb/s. When the bit rate is increased to 6.8 kb/s, near-toll-quality speech is achieved. >
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