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Abstract

For the purpose of designing a method to control the main speech parameters for keyword emphasis in a text-to-speech synthesizer, the relation between speech parameters and emphasis level is determined from experiments. Twelve subjects are instructed to modify keyword emphasis to achieve natural sounding speech from three sentences. An interactive speech editor with a graphical user interface is developed for the experiments. The editor allows the subjects to control speech intensity, speech rate and average fundamental frequency of the keyword, and of the other sentence components. Furthermore, subjects can also control pause (silence) duration preceding and following the keyword. Extracted relations between prosodic feature parameters and emphasis level shows that speech intensity and speech rate are independent of sentence content. Speech intensity increases linearly and speech rate decreases linearly with emphasis level. On the other hand, average fundamental frequency and pause duration depend on sentence content, and relatively large changes are required to strongly emphasize keywords using pause insertion and increased fundamental frequency.

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Control of Prosodic Features for Keyword Emphasis in a Text-to-Speech Synthesizer

Abstract

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References