Device and method for frame lost concealment
US7778824B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 8, 2008 |
| Grant date | Aug 17, 2010 |
| Priority date | — |
| Expiry date | Dec 8, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L19/24
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A device and a method for frame lost concealment are disclosed. A pitch period of a current lost frame is obtained on the basis of a pitch period of the last good frame before the current lost frame. An excitation signal of the current lost frame is recovered on the basis of the pitch period of the current lost frame and an excitation signal of the last good frame before the lost frame. Thereby, the hearing contrast of a receiver is reduced, and the quality of speech is improved. Further, in the present invention, a pitch period of continual lost frames is adjusted on the basis of the change trend of the pitch period of the last good frame before the lost frame. Therefore, a buzz effect produced by the continual lost frames is avoided, and the quality of speech is further improved. In addition, by attenuating the energy of the excitation signal obtained from the continual lost frames, the device and method accord with the hearing physiological characteristics of human and reduce the hearing contrast of the receiver.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.