Pitch period vector multi-mode quantization method and system based on sound channel information clustering

The invention discloses a pitch period vector multi-mode quantization method and a pitch period vector multi-mode quantization system based on sound channel information clustering. The pitch period vector multi-mode quantization method comprises the following steps: constructing a line spectrum frequency parameter quantization codebook, a pitch period parameter quantization initial codebook and a line spectrum frequency parameter classification initial codebook; quantizing the line spectrum frequency vector and the pitch period vector to obtain a quantized index of a line spectrum frequency parameter; acquiring a pitch period parameter corresponding to the spectral frequency parameter under each quantization index and probability distribution thereof; updating the line spectrum frequency parameter classification initial codebook according to the probability distribution to obtain a line spectrum frequency parameter classification codebook, and obtaining a pitch period parameter quantization codebook under eac