Method and apparatus for concealing packet loss, and apparatus for transmitting and receiving speech signal
US8374856B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 9, 2009 |
| Grant date | Feb 12, 2013 |
| Priority date | — |
| Expiry date | Dec 16, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L25/90
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for concealing frame loss and an apparatus for transmitting and receiving a speech signal that are capable of reducing speech quality degradation caused by packet loss are provided. In the method, when loss of a current received frame occurs, a random excitation signal having the highest correlation with a periodic excitation signal (i.e., a pitch excitation signal) decoded from a previous frame received without loss is used as a noise excitation signal to recover an excitation signal of a current lost frame. Furthermore, a third, new attenuation constant (AS) is obtained by summing a first attenuation constant (NS) obtained based on the number of continuously lost frames and a second attenuation constant (PS) predicted in consideration of change in amplitude of previously received frames to adjust the amplitude of the recovered excitation signal for the current lost frame. Speech quality degradation caused by packet loss can be reduced for enhanced communication quality in a packet network environment with continuous frame loss.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.