Detection of a call-waiting tone by a modem
US6333974A · kind A · utility
9Cited by
8References
40Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 26, 1998 |
| Grant date | Dec 25, 2001 |
| Priority date | — |
| Expiry date | May 26, 2018 |
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.