Abstract: A speech synthesis system includes an operating interface, a storage unit and a processor. The operating interface provides a plurality of language options for a user to select one output language option therefrom. The storage unit stores a plurality of acoustic models. Each acoustic model corresponds to one of the language options and includes a plurality of phoneme labels corresponding to a specific vocal. The processor receives a text file and generates output speech data corresponding to the specific vocal according to the text file, a speech synthesizer, and one of the acoustic models which corresponds to the output language option.

Abstract: An audio playback device receives an instruction from a user to select a target voice model from a plurality of voice models and assigns the target voice model to a target character in a text. The audio playback device also transforms the text into a speech, and during the process of transforming the text into the speech, transforms sentences of the target character in the text into the speech of the target character according to the target voice model.

Abstract: A speech synthesis system includes an operating interface, a storage unit and a processor. The operating interface provides a plurality of language options for a user to select one output language option therefrom. The storage unit stores a plurality of acoustic models. Each acoustic model corresponds to one of the language options and includes a plurality of phoneme labels corresponding to a specific vocal. The processor receives a text file and generates output speech data corresponding to the specific vocal according to the text file, a speech synthesizer, and one of the acoustic models which corresponds to the output language option.

Abstract: An audio playback device receives an instruction from a user to select a target voice model from a plurality of voice models and assigns the target voice model to a target character in a text. The audio playback device also transforms the text into a speech, and during the process of transforming the text into the speech, transforms sentences of the target character in the text into the speech of the target character according to the target voice model.

Abstract: A system and a method for identifying baby needs are disclosed. The system stores a heart rate variability (HRV) feature model comprising a relationship between HRV features and baby needs. The system receives a time-series skin image signal of a baby, and converts the time-series skin image signal into a target photoplethysmography (PPG) signal. The system also calculates a set of target HRV features according to the target PPG signal, and determines a target need of the baby according to the HRV feature model and the set of target HRV features.