System and method for selective filter isolation
US6459790B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 27, 1999 |
| Grant date | Oct 1, 2002 |
| Priority date | — |
| Expiry date | Aug 27, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M11/062
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
In a system including a plurality of telephones coupled to an asymmetric digital subscriber line, a circuit operable to facilitate communication using the asymmetric digital subscriber line includes a filter having a corner frequency and being operable to be coupled between one of the plurality of telephones and the asymmetric digital subscriber line. The filter is also operable to attenuate transients associated with the telephone operating in an off-hook state. The circuit also includes a switch coupled to the filter. The switch is operable to effect a change in the corner frequency of the associated filter depending on whether the telephone coupled to the filter is operating in an on-hook or an off-hook state, the change in the corner frequency operating to attenuate parasitic interference associated with telephones in an on-hook state.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.