How can MPEG-4 TTS interface operate with FA tools synchronously?

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How can MPEG-4 TTS interface operate with FA tools synchronously?

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MPEG-4 TTS interface passes phoneme symbols with their duration and average pitch information to the phoneme-to-FAP (Facial Animation Parameter) converter. Then the phoneme-to-FAP converter generates FAPs with its duration for the corresponding phoneme and passes the information to FA tools. From this information FA tools can generate face images in synchronization with synthesized speech.

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