2.4 kbps pitch prediction multi-pulse speech coding

2.4-kb/s speech coding based on pitch-prediction multipulse speech coding is described. An adaptive segmentation procedure to effectively control the renewal rate for synthesis model parameters, a linear time-varying pitch-synthesis filter, a model for multipulse excitation during one pitch period, and a vector quantization for linear predictive coding parameters are introduced. Subjective evaluation demonstrates that pitch-prediction multiphase speech coding can provide much more natural-sounding synthetic speech than single-pulse-excitation speech coding (as with a vocoder) or pitch-interpolation multipulse speech coding at 2.4-kb/s