CPE alert signal tone detector
US6393124B1 · kind B1 · utility
7Cited by
5References
32Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 5, 1997 |
| Grant date | May 21, 2002 |
| Priority date | — |
| Expiry date | Nov 5, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M1/573
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Multiple characteristics of an signal are measured to determine the presence of an alert tone on an incoming signal to a customer premises equipment (CPE) in preparation for receipt of FSK modem signals. The apparatus, method, and article of manufacture discern the presence of an alert tone by measuring characteristics of the incoming signal. The alert tone is able to be discerned even under crosstalk conditions and over a wide dynamic range with the digital signal processing (DSP) method and apparatus described. Multiple characteristics of the signal are measured to determine the presence of the alert tone.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.