| 摘要 |
PROBLEM TO BE SOLVED: To effectively and efficiently compress inharmonic components. SOLUTION: Waveform data to be compressed are separated by a proper method into harmonic components and inharmonic components, which are supplied separately (S20). To perform vector quantization for at least the inharmonic components, the inharmonic components are divided into plural sections (21) according to the waveform shape of the inharmonic components. Consequently, the inharmonic component waveform can be divided into sections at proper places where data compression efficiency is good and waveform reproducibility is not spoiled so much judging from the waveform shape of the inharmonic components. Inharmonic vectors as representative vectors of the inharmonic components are selected and specified respectively by the divided sections, thereby performing the vector quantization (S25) (S26). Thus, the inharmonic component waveform itself is analyzed and an original vector quantizing process can easily be performed. |
