Caller identification transmit path limiter
US5315650A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 3, 1993 |
| Grant date | May 24, 1994 |
| Priority date | — |
| Expiry date | May 3, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M1/82
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A transmit path limiting circuit that allows other equipment, such as a caller identification device, to more readily decipher information signals on a telephone line. The circuit includes a ring detector, register, and controller. The ring detector senses that a call is incoming to the telephone and responsively provides an initiation signal. The register normally transmits outgoing signals from the telephone to the telephone network. After receiving the initiation signal, however, the controller enables the register, for a predetermined interval, to transmit a quiet code in lieu of any signal being transmitted from the telephone. Consequently, reflected noise is lowered during the predetermined interval, so that the caller identification box may more easily interpret data on the telephone line.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.