| 摘要 |
PROBLEM TO BE SOLVED: To realize efficient encodings, while encoding voice signals in a hierarchical manner, while using a CELP system vice coding in an expanding layer. SOLUTION: A first encoding section 115 conducts a CELP system voice encoding processing to input signals S11 and outputs obtained first encoded information S12 to a parameter decoding section 120. The parameter-decoding section 120 obtains a first quantizing LSP code (L1), a first adaptive sound source lag code (A1) or the like from the first encoded information S12, obtains a first parameter group S13 from these codes and outputs the group S13 to a second coding section 130. The second encoding section 130 conducts a second encoding processing to the input signals S11 using the first parameter group S13 to obtain second encoded information S14. A multiplexing section 154 multiplexes the first and the second encoded information S12 and S14 and outputs them to a decoding device 150 via a transmission path N. COPYRIGHT: (C)2006,JPO&NCIPI
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