Hook switch status glitch filter
US6704416B1 · kind B1 · utility
1Cited by
3References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 27, 2000 |
| Grant date | Mar 9, 2004 |
| Priority date | — |
| Expiry date | Mar 27, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M1/738
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A line card circuit using a pair of comparators such that the output of the first comparator is coupled to an input of the second comparator through an RC circuit. The RC circuit is tuned such that short transients, such as false pulses and false off hook indications passed by the first comparator are not passed by the RC circuit to the second comparator. The input of the first comparator is coupled to the subscriber line and the output of the second comparator is coupled to the switch's hook status detection circuitry.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.