Fully vector-quantized multipulse LPC at 4800 bps

A conceptually new approach for describing the excitation signal in multipulse-excited LPC has been developed. The information needed to determine the excitation for each frame is transmitted to the receiver in the form of a crosscorrelation function. With the help of the LPC filter parameters, the receiver computes the excitation pulse sequence needed to generate the reconstructed speech waveform. Both the crosscorrelation function and the set of LPC parameters are coded by vector quantization. We utilize a classified codebook assignment technique in VQ for the crosscorrelation. This paper describes the coder structure, the use of vector quantization, and the results of computer simulation studies.