Call-waiting tone detection technique
US6704400B1 · kind B1 · utility
2Cited by
5References
25Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 16, 2002 |
| Grant date | Mar 9, 2004 |
| Priority date | — |
| Expiry date | Dec 16, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M3/4281
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Reliable detection of a call-waiting tone is provided by employing a correlation based technique. A modem or other device employing such a technique need not rely on carrier drop detection and is generally insensitive to other energy or noise on the line.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.