Pitch modification method by glottal closure interval extrapolat

Details Pitch modification method by glottal closure interval extrapolat Pitch modification method by glottal closure interval extrapolat

1998-08-21

2000-09-26

Dorvil, Richemond

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704205, 704201, 704264, 704268, 704258, 704207, G10L 2100, G10L 1300

Patent

active

061253448

ABSTRACT:
The present invention relates to an improved pitch modification method by glottal closure interval extrapolation. It is an object of the present invention to modify pitches of speech signals by the glottal closure interval extrapolation and to maintain quality of the modified speech, when concatenating original speech segments to synthesize speech. An input speech signal is converted into a digital speech signal. A glottal closure interval is detected in the digital speech signal so as to estimate vocal tract parameters by using pitch synchronous analysis. Vocal tract characteristic signals of the glottal closure interval and glottal characteristic signals of a glottal open interval are separated from each other according to the detected glottal closure interval. The separated vocal tract characteristic signals are extrapolated and reduced to a desired pitch length by the estimated vocal tract parameter. The extrapolated and reduced vocal tract characteristic signals are overlapped and added to the separated glottal characteristic signal so as to generate a synthetic speech signal which varies in a desired pitch length.

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Moulines et al. Pitch-Synchronous Waveform Processing Techniques For Text-To-Speech Synthesis Using Diphones, Speech Communication 9 (1990) 4453-467.

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