Cordless communications systems
US5651051A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 15, 1995 |
| Grant date | Jul 22, 1997 |
| Priority date | — |
| Expiry date | Sep 15, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M1/72505
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A communications system for establishing radio transmission and reception between one or more base units and one or more portable units. Upon reception at a base unit of an incoming call a first callout signal is transmitted to one or more portable units by the base unit. This first call out signal does not contain any information about operating a ringing device located in each portable unit, however, when the sequence signal from the first portable unit to respond to the callout signal is received by the base unit, the base unit sends out a second callout signal. This second callout signal contains information which starts a ringing cadence off, at the beginning of the cadence, in the ringing device in the first portable unit to respond and thus there is always only a small delay between a base unit and a portable unit making contact and the portable unit beginning to ring.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.