Telephone ring signal detector
US6556673B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 12, 1999 |
| Grant date | Apr 29, 2003 |
| Priority date | — |
| Expiry date | Nov 12, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M1/82
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A telephone ring signal detector is coupled to a telecommunication line for detecting a first telephone ring signal, and for discriminating the first telephone ring signal from other line signals on the line. This detector comprises an event generator, coupled to the line, for receiving an incoming signal and for generating an initial event signal and an ending event signal, and a signal characteristic generator, coupled to the line and to the event generator, for generating a signal characteristic of the incoming signal after the initial event signal. This detector further comprises a signal characteristic limit device, for generating a predetermined signal characteristic range limit of the first telephone ring signal, and a signal characteristic comparator coupled to the signal characteristic generator, to the signal characteristic limit device and to the event generator, for comparing the signal characteristic with the predetermined signal characteristic range limit. A valid compare signal is generated when the signal characteristic is within the predetermined signal characteristic range limit. A ring detect signal is generated during the first quarter cycle time period of the f…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.