Method and device for vector quantifying of guide resistance spectrum frequency parameter

The invention discloses a vector quantization method of an immittance spectrum frequency (ISF) parameter and a vector quantization device of the ISF. The invention also closes a vector quantization coding end method of the ISF parameter, a vector quantization decoding end method of the ISF parameter, a vector quantization device of the ISF parameter, a vector quantization coding end device of the ISF parameter and a vector quantization decoding end device of the ISF parameter. The methods or devices utilize prediction coefficients of unequal coefficient interframe predictor in each dimension to compute the prediction vector of the ISF parameter. Applying the invention can equalize the quantization performances when losing the frame or not in the process of bandwidth voice coding and decoding, improving the quality of voice synthesis.