Communication device
US8514459B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 10, 2008 |
| Grant date | Aug 20, 2013 |
| Priority date | — |
| Expiry date | Mar 21, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M11/066
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A communication device transmits voice and facsimile signals in the same channel between a terminal device and a packet network. The communication device has an echo canceler and a jitter buffer. The jitter buffer has a delay recovery control function that selectively deletes data from the jitter buffer to recover from packet delays. After detecting a facsimile tone, the communication device waits to detect a certain interval of silence, then deactivates its echo canceler and delay recovery control function and switches into facsimile communication mode. If a certain interval of silence is detected during the facsimile transmission, the communication device reactivates its echo canceler and delay recovery control function and continues communicating in voice mode if the line is left connected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.