| 摘要 |
PROBLEM TO BE SOLVED: To obtain a high-quality synthetic sound. SOLUTION: In the receiving part 114 of a portable telephone of a CELP (Code Excited Liner Prediction coding) mode, a residual signal and a linear predictor coefficient and decoded from an L cord, G code, I code, and A code. In a speech synthesis filter 29, a synthetic sound is generated from the decoded residual signal and linear predictor coefficient. A classifying part 123 performs classification on the basis of a class tap generated from the L code, G code, I code, A code, the decoded residual signal and the linear predictor coefficient and outputs a corresponding class code to a coefficient memory 124. The coefficient memory 124 outputs a tap coefficient corresponding to the class code. A prediction part 125 determines the predicted value of a high-quality vocal sound by using the tap coefficient and the synthetic sound outputted by the speech synthesis filter 29. |
