| 摘要 |
The device and method allow an inputted optimum gain to be converted to the vector (input) of the element of a ratio and a sum in a parameter conversion part. In a target extraction part, based on the vector obtained in the parameter conversion part, a target vector is obtained by using a decoding vector in the past stored in a decoding vector storage part and a prediction coefficient stored in a prediction coefficient storage part. In a distance calculation part, by using the prediction coefficient, a distance between the target vector obtained in the target extraction part and the code vector of a vector code book is calculated. A comparison part obtains the vector for minimizing the calculated distance and turns it to the code of the gain.
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