Hanna Silén, Elina Helander, Jani Nurminen, Moncef Gabbouj, Tampere University of Technology, Department of Signal Processing
Appropriate phoneme durations are essential for high quality speech synthesis. In hidden Markov model-based text-to-speech (HMM-TTS), durations are typically modeled statistically using state duration probability distributions and duration prediction for unseen contexts. Use of rich context features enables synthesis without high-level linguistic knowledge. In this paper we analyze the accuracy of state duration modeling against phone duration modeling using simple prediction techniques. In addition to the decision tree-based techniques, regression techniques for rich context features with high collinearity are discussed and evaluated.