Adaptive bit allocation for LSP parameter quantization
Fang Hui, Ian Vince McLoughlin · 2002
Line spectral pairs (LSPs) convey vocal tract information for reconstruction of speech in an analysis-synthesis speech coding system. Quantization of LSP parameters is necessary to reduce bit-rate, but causes unavoidable degradation in quality. This paper proposes an adaptive quantization method to reduce bit-rate whilst maintaining reasonable speech quality. The method exploits the observed relationship between LSP locations and underlying speech characteristics.