This paper introduces a new linear predictive modelling technique based on using a high-order LPC filter having only few non-zero coefficients. Efficient algorithms were developed to find the non-zero coefficients for the cases of transversal filter and lattice filter implementations. Coupling with multi-pulse analysis procedure for vocoding, the new modelling technique can produce good-quality synthetic speech at low data rates.
Bibliographic reference. Chan, C. F. / Leung, S. H. (1991): "A vocoder using high-order LPC filter with very few non-zero coefficients", In EUROSPEECH-1991, 839-842.