Abstract
PROBLEM TO BE SOLVED: To improve the quality of a composite signal when an LPC coefficient is efficiently quantized and an input signal is restored through a decoder.
SOLUTION: There is provided a determination method for a weighted value function the method comprising the steps of: obtaining a linear spectrum frequency (LSF) coefficient or immittance spectrum frequency (ISF) coefficient from a linear predictive coding (LPC) coefficient of an intermediate subframe of an input signal; normalizing the LSF coefficient or ISF coefficient on the basis of the number of spectrum bins of the intermediate subframe; and determining a weighted value function of the intermediate subframe on the basis of the size of the spectrum bin corresponding to a frequency of the normalized LSF coefficient or normalized ISF coefficient.
SELECTED DRAWING: Figure 2
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