Integrated ringer relay circuit and method
US5517565A · kind A · utility
5Cited by
9References
31Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 30, 1994 |
| Grant date | May 14, 1996 |
| Priority date | — |
| Expiry date | Jun 30, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M19/026
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A circuit and method for isolating a subscriber line interface circuit ("SLIC") from the ringer generator in a telephone system. The circuit uses a gain blocking device to provide a signal gain when the ringer generator is not being utilized and to provide a high impedance when a ringer signal is present. The high impedance may be provided through an amplifier circuit which is tri-stated when the amplifier is not energized.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.