| 摘要 |
PROBLEM TO BE SOLVED: To improve the quality of speech to be decoded, by properly selecting information to be encoded by an analytic synthesis type speech encoding and decoding device. SOLUTION: After a band-pass filter section 133 decomposes a residue signal generated by a predictive analysis section 131 into components for each band, a gain calculating section 135 and a voiced/voiceless discrimination and pitch extracting section 137 find intensities featuring the respective bands, voiced/voiceless discrimination, and a pitch frequency in the case of the voiced sound, encode them together with a prediction coefficient, and transmit them to a decoding device. The decoding device generates an excitation signal while reflecting features of the respective bands of the original residue signal, the excitation signal therefore is a signal where the original residue signal is efficiently reproduced. COPYRIGHT: (C)2008,JPO&INPIT
|
