Method of lost frame concealment and device
US8355911B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 14, 2009 |
| Grant date | Jan 15, 2013 |
| Priority date | — |
| Expiry date | Oct 4, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L25/18
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A device for lost frame concealment comprises: a lost frame detector for detecting whether a voice frame is lost, a decoding module for decoding the current voice frame, a low band delay module for delaying the low band signal, a low band signal recovering module for recovering the lost low band signal, a high band lost frame concealment module for processing the lost frame concealment for the high band signal, and a QMF synthesis filter for synthetically filtering the low band signal and the high band signal. The invention makes full use of the delay of the coding/decoding device itself, enhances the effect of lost frame concealment for the low band signal and the high band signal, and introduces no nearby delay during the process of lost frame concealment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.