| 摘要 |
PROBLEM TO BE SOLVED: To provide an encoding device capable of encoding an audio signal of high quality input having no harmonic relation and greatly improving the encoding efficiency, and a decoding device therefor. SOLUTION: The encoding device comprises a section setting means 12 of setting a prescribed unit section and a plurality of measurement sections of the audio signal, a section signal generating means 13 of generating a plurality of section signals from a measurement start position, a frequency component extracting means 15 of extracting frequencies and components included in the respective section signals and subtracting the components of the extracted frequencies to find residue levels, and a variable length encoding unit 17 which finds average residue levels by dividing the residue levels of the respective section signals by the measurement sections, selects the measurement section of the section signal giving the least average residue level among the average residue levels, and the extracted frequencies and components of the frequencies as component values by a section selecting means 16, and encodes the respective selected values. The decoding device decodes an encoded signal and outputs an audio signal. COPYRIGHT: (C)2008,JPO&INPIT
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