Telephone circuit
US5699418A · kind A · utility
36Cited by
6References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 22, 1996 |
| Grant date | Dec 16, 1997 |
| Priority date | — |
| Expiry date | Mar 22, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M1/571
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A single phase locked loop based device is used to detect alert tones and to decode data in caller display services signalling systems. The device has two sets of components (resistors) to configure the device to perform tone detection and data decoding. One or both of the sets of components are connected to the device by an electronically controlled switch.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.