Delayed packet concealment method and apparatus
US6721327B1 · kind B1 · utility
18Cited by
7References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 14, 1999 |
| Grant date | Apr 13, 2004 |
| Priority date | — |
| Expiry date | May 14, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2012/6481
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A decoder improves delayed packet concealment in a packet network by using two decoder sections. A first decoder section bases its decoding during the concealment phase on erroneous filter states and a set of speech parameters, whereas a second decoder section bases its decoding on saved and updated filter states and the same speech parameters. The outputs of the two decoder sections are thereafter combined to form the final speech signal. This decoding strategy produces a speech signal with smooth transitions from delayed to non-delayed packets and uses information from the most recent packets for speech generation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.