Voice characteristics conversion for HMM-based speech synthesis system

Created: 2022-05-22T21:22:09-05:00

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• Learn to synthesize a voice with an appropriately large dataset.
• Learn a new voice by fitting the existing dataset to the new voice samples.
• Use some math to smooth and interpolate the remaining edge cases.

Structure

• Voice data is analyzed by mel-celstrum analysis.
• Correlation between phonemes and mel-cepstrum parameters is done with a phoneme layer.
• Correlation of sentence words to phonemes is done with another HMM layer.

Converting trained network to a new speaker

• Maximum A Posteriori (MAP) estimation and Vector Field Smoothing (VFS) algorithms.

• MAP estimation is used to start with existing tuning and increment it towards known data about the new voice.
• VFS is used to interpolate data from the new incoming voice where no training data was available.