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2. MMDAgentMMDAgent is a toolkit for building voice interaction systems. It utilizes Julius [5] as a voice recognition engine,Open JTalk [6] as a text-to-speech engine, MikuMikuDance [7] as a 3D model, and Bullet Physics [8] as a Physics engine. MMDAgent for Android, which functions as a standalone app on smartphones, has also been developed (Fig.1).MMDAgent operates on the basis of Finite State Transition (FST) written by a script file called the FST script.An example of an FST script is shown in Fig. 2. The script is composed of transition source state numbers, destination state numbers, transition conditions (events), and commands. As shown in Fig. 2, first, in state number 1,MMDAgent recognizes the word ”hello.” Next, the statenumber changes from one to 10 and MMDAgent says”hello.” The state number subsequently changes from 10 to 11 and then from 11 back to one. FST scripts are relatively easy to rewrite; consequently, it is possible to realize voicenavigation with MMDAgent by converting guide annotationsinto FST scripts. It also is possible to simultaneously activate various state transitions because multiple FST scripts can be applied in parallel by using sub-FST scripts. In other words, MMDAgent can operate according to multiple state transitions in parallel. One of the major advantages ofMMDAgent on smartphones is response speed. It carries out navigation smoothly because the app operates in standalonemode, and so voice synthesis and voice recognition can both operate in real time on a smartphone, without any delay dueto the network.
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