DEVICE AND METHOD FOR CELP TYPE VOICE ENCODING

摘要

PROBLEM TO BE SOLVED: To obtain a synthesized voice of higher quality by providing a pulse vector generation part which supplies pulse vectors, a diffusion pattern storage and selection part, a pulse vector diffusion part which convolutes diffusion patterns selected by the selection part and pulse vectors, etc. SOLUTION: The pulse vector generation part 216 algebraically generates a pulse vector according to a specific rule and outputs it to a pulse vector diffusion part 217. The pulse vector diffusion part 217 generates diffusion vectors by channels from diffusion patterns selected by a diffusion pattern storage and a selection part 215 and pulse vectors generated by the pulse vector generation part 216 through convolution operation using a specific calculation expression. A diffusion vector addition part 218 adds diffusion vectors obtained by the pulse vector diffusion part 217 to generate a sound source vector. Then a distortion calculation part 206 calculates a specific value by using noise code vector candidates obtained by the diffusion vector addition part 218.