Fast Concatenative Speech Synthesis Using Pre-Fused Speech Units Based on the Plural Unit Selection and Fusion Method(Speech and Hearing)
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概要
- 論文の詳細を見る
We have previously developed a concatenative speech synthesizer based on the plural speech unit selection and fusion method that can synthesize stable and human-like speech. In this method, plural speech units for each speech segment are selected using a cost function and fused by averaging pitch-cycle waveforms. This method has a large computational cost, but some platforms require a speech synthesis system that can work within limited hardware resources. In this paper, we propose an offline unit fusion method that reduces the computational cost. In the proposed method, speech units are fused in advance to make a pre-fused speech unit database. At synthesis time, a speech unit for each segment is selected from the pre-fused speech unit database and the speech waveform is synthesized by applying prosodic modification and concatenation without the computationally expensive unit fusion process. We compared several algorithms for constructing the pre-fused speech unit database. From the subjective and objective evaluations, the effectiveness of the proposed method is confirmed by the results that the quality of synthetic speech of the offline unit fusion method with 100MB database is close to that of the online unit fusion method with 93MB JP database and is slightly lower to that of the 390MB US database, while the computational time is reduced by 80%. We also show that the frequency-weighted VQ-based method is effective for construction of the pre-fused speech unit database.
- 一般社団法人電子情報通信学会の論文
- 2007-02-01
著者
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Tamura Masatsune
Multimedia Laboratory Corporate Research & Development Center Toshiba Corporation
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Mizutani Tatsuya
Semiconductor Company Toshiba Corporation
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Kagoshima Takehiko
Multimedia Laboratory Corporate Research & Development Center Toshiba Corporation