Voice packet communications system with communications quality evaluation function
US7489678B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 24, 2005 |
| Grant date | Feb 10, 2009 |
| Priority date | — |
| Expiry date | Aug 28, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2012/6481
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A voice packet communications system which objectively evaluates the voice quality in real time. Voice packets received from a network are input into an adjustment circuit. The adjustment circuit evens out the periods of the voice packets, detects the drop-out of voice packets, and inserts substitute packets in the voice packet sequence. Furthermore, the adjustment circuit outputs the number of voice packets that have dropped out, the number of substitute packets that have been inserted, and the number of voice packets that have accumulated inside the circuit, as quality information in each monitoring period. A decoding circuit converts the voice packets adjusted by the adjustment circuit into voice information. A judgment circuit calculates an index that indicates the communications quality of the voice packets from the quality information using a specified calculation formula.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.