Tone detector for use in a modem
US6711205B1 · kind B1 · utility
2Cited by
86References
41Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 25, 1998 |
| Grant date | Mar 23, 2004 |
| Priority date | — |
| Expiry date | Sep 25, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04Q1/44
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A tone detector for a modem detects the presence of a tone, such as that sent during a retraining request, using a complex adaptive FIR filter of the form 1−z−1. The filter will detect the tone regardless of symbol rate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.