| 摘要 |
PROBLEM TO BE SOLVED: To provide voice data compressing decompression device and method, which enable realization of voice synthesis real time, by changing a compressing method for waveform data to shorten the decompressing time. SOLUTION: The waveform data are extracted by referring to the existing waveform dictionary, a use frequency used for voice synthesis with respect to the waveform data are accumulated and stored, the compressing method is changed in stages according to the use frequency to compress the waveform data, the compressed waveform data are stored in a waveform dictionary, information on compressing methods about the respective decompressed waveform data are also stored, and the compressed waveform data are decompressed, on the basis of the information on the compressing methods. One or a plurality of prescribed thresholds are determined regarding the use frequency of the waveform data, and the waveform data are compressed by using a compressing method having higher compressibility in stages, the smaller use frequency range the use frequency belongs to within a plurality of use frequency ranges divided by the thresholds.
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