| 摘要 |
PROBLEM TO BE SOLVED: To provide a sound decoding system for generating a decoded sound with high sound quality, and also to provide its method, and its program. SOLUTION: The system includes: a flatening means (104); a copying means (105); and an envelope adding means (106), and comprises a function to generate the frequency signal of a certain frequency band by flatening a spectrum approximate form concerning a part of a frequency area signal which is decoded by a conventional decoding means, copying it to another frequency band, and adding the proper spectrum approximate form to the copied flat signal. The code amount of information about which kind of spectrum approximate form is added is generally smaller than the code amount which is generated by Huffman encoding in the frequency band, so that efficiency is raised in encoding. COPYRIGHT: (C)2004,JPO
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