Enhancement of speech signals transmitted over a vocoder channel
US6081777A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 21, 1998 |
| Grant date | Jun 27, 2000 |
| Priority date | — |
| Expiry date | Sep 21, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L21/0232
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
In a vocoder system, the receiver is arranged to emphasize at least the fundamental or lowest-frequency sinusoidal signal in response to the pitch, in a manner which provides more emphasis at lower pitch values, corresponding to larger pitch intervals. The emphasis provides a subjectively improved speech synthesis. In a preferred embodiment, the enhancement takes place at fundamental component frequencies below 400 Hz. According to another aspect of the invention, the second and third harmonics are also emphasized, but generally not as much as the fundamental component. Below certain frequencies, the enhancement is limited for the fundamental and the harmonics.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.