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Text-to-speech using clustered context-dependent phoneme-based units

  • US 6,163,769 A
  • Filed: 10/02/1997
  • Issued: 12/19/2000
  • Est. Priority Date: 10/02/1997
  • Status: Expired due to Term
First Claim
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1. A method for generating speech from text, comprising the steps of:

  • storing a set of decision tree context-dependent phoneme-based units of a target speaker, wherein a central phoneme-based unit is selected from a group consisting of a phoneme and a diphone, wherein each context-dependent phoneme-based unit is arranged based on context of at least one immediately preceding and succeeding phoneme-based unit, and wherein one context-dependent phoneme-based unit is chosen to represent each leaf node in the decision trees;

    obtaining a string of phonetic symbols representative of a text to be converted to speech;

    selecting stored decision-tree based context-dependent phoneme-based units from the set of decision tree based context-dependent phoneme-based units based on the contexts of the phonetic symbols; and

    synthesizing the selected context-based phoneme-based units to generate speech corresponding to the text.

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