Research on Line Spectrum Frequency Coding Algorithm

Speech coding often relies on vector quantization technology for the quantization coding of line spectrum frequency. In low-rate speech coding systems, the quantization of line spectrum frequency frequently employs the multi-frame joint vector quantization method. This paper analyzes the multi stage vector quantization algorithm in the standard MELP speech coding system and explores the multi-frame multi-stage vector quantization algorithm. Additionally, it introduces the autoregressive prediction model in conjunction with the multistage vector quantization algorithm, incorporating inter-frame and inter-stage prediction. The design of a multi-stage vector quantization codebook for inter-frame and inter-stage prediction with autoregressive prediction is presented. The effectiveness of this approach is compared with the line spectrum frequency quantization algorithm in the standard MELP speech coding system, yielding positive results.