06975987 is referenced by 11 patents and cites 20 patents.

The present invention provides pitch conversion processing technology capable of minimizing the distortion of speech sound naturalness. A speech waveform in a pitch-unit is considered to be divided into two segments: 1) the segment of β, that starts from the minus peak, where the waveform depending on the shape of vocal tracts appears, and 2) the segment of γ where the waveform depending on the vocal tract shape is attenuating and converging on the next minus peak. In addition, α is the point where a minus peak appears along with the glottal closure. Based on characteristics of speech waveforms, the present invention processes waveform for converting pitch in the segment of γ just before the next minus peak, which is least affected by the minus peak associated with the glottal closure. As such, waveform processing can be performed by keeping the complete contour of waveform at around the peak, and thereby reducing the effects of pitch conversion.

Title
Device and method for synthesizing speech
Application Number
9/678544
Publication Number
6975987 (B1)
Application Date
October 4, 2000
Publication Date
December 13, 2005
Inventor
Toshio Hirai
Minoh
JP
Seiichi Tenpaku
Minoh
JP
Agent
Pillsbury Winthrop Shaw Pittman
Michael Bednarek
Assignee
Arcadia
JP
IPC
G01L 013/04
G01L 013/00
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