Apparatus for synthesizing speech by varying pitch
US5787398A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 26, 1996 |
| Grant date | Jul 28, 1998 |
| Priority date | — |
| Expiry date | Aug 26, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L13/07
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The pitch of synthesized speech signals is varied by separating the speech signals into a spectral component and an excitation component. The latter is multiplied by a series of overlapping window functions synchronous, in the case of voiced speech, with pitch timing mark information corresponding at least approximately to instants of vocal excitation, to separate it into windowed speech segments which are added together again after the application of a controllable time-shift. The spectral and excitation components are then recombined. The multiplication employs at least two windows per pitch period, each having a duration of less than one pitch period. Alternatively each window has a duration of less than twice the pitch period between timing marks and is asymmetric about the timing mark.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.