Abstract
Lack of punctuation in Indian language text makes the analysis of phrases difficult. In this paper, inter-pausal units IPUs in read sentences are considered as phrases and are analyzed. A key observation from this analysis is that the length of the IPUs in read sentences follow uniformly across all languages a Gamma distribution. Additionally, an analysis of the scale and shape parameters suggest that these parameters are governed by the location of the IPU in an utterance. This information is used in text-to-speech TTS systems for four Indian languages leading to an improvement in naturalness. A novel IPU-based TTS system is proposed for better prosody modeling as well. A given text is parsed into IPUs, and an appropriate TTS system for different IPUs is used for synthesis. It is observed that there is a significant improvement in the naturalness of synthesized speech compared to that of a single TTS system being used for the entire sentence.
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