| 摘要 |
PROBLEM TO BE SOLVED: To prevent quality deterioration when a pitch period is different from a repetition period. SOLUTION: A period preselecting means 23 finds repetition period candidates of a plurality of driving sound sources by multiplying the repetition period of an adaptive sound source by a plurality of constants and selects repetition period candidates of a predetermined number of driving sound sources. A driving sound source encoding means 27 outputs the evaluation values of sound source positions where encoding distortion is minimized, polarities and the encoding distortions at that time by the repetition period candidates of the predetermined number of driving sound sources. A period encoding means 28 compares the evaluation values of the encoding distortions by the repetition periods, selects a repetition period candidate of the driving sound source based on the comparison result, and outputs selection information, a sound position code and a polarity. COPYRIGHT: (C)2009,JPO&INPIT
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