Speech synthesis device, speech synthesis method, and computer program product

A speech synthesis method implemented by a computer, the method comprising:

• executing encoder processing with a first neural network to convert attribute information of a speech unit into an intermediate representation;
• executing decoder processing with a second neural network to generate an acoustic feature from the intermediate representation;
• and
• executing adjustment processing by
• using an adjustment dictionary in which at least the attribute information of the speech unit is set as a key and an adjustment instruction to the acoustic feature is set as a value,
• defining, by the key, a section to which the adjustment instruction is applied, and
• adjusting the acoustic feature in the defined section based on the adjustment instruction.

A computer program product comprising a non-transitory computer readable recording medium on which programmed instructions executable by a computer are recorded, the instructions causing the computer to perform processing, the processing including:

• executing encoder processing with a first neural network to convert attribute information of a speech unit into an intermediate representation;
• executing decoder processing with a second neural network to generate an acoustic feature from the intermediate representation;
• and
• executing adjustment processing by
• using an adjustment dictionary in which at least the attribute information of the speech unit is set as a key and an adjustment instruction to the acoustic feature is set as a value,
• defining, by the key, a section to which the adjustment instruction is applied, and
• adjusting the acoustic feature in the defined section based on the adjustment instruction.