Cordless telephone system
US4882746A · kind A · utility
Inventor
Key dates
| Filing date | Mar 17, 1988 |
| Grant date | Nov 21, 1989 |
| Priority date | — |
| Expiry date | Mar 17, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M1/65
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A cordless telephone system has a master unit connected to a telephone line and having a radio transceiver and a plurality of sub-units having radio transceivers and transmittable to and receivable from the telephone line through the master unit. Speech from the telephone line can be transferred between any sub-units, and speech by press-to-talk system is enabled between any sub-units through the master unit. A multi-purpose controller is provided in the master unit to enable control of an equipment by dialing from a sub-unit. For example, a tape recorder is operated, an automatic response/record function is operated, an interphone function is operated, a call from the telephone line can be directed to any sub-unit by a signal from the sub-unit, and all sub-units can be simultaneously or sequentially called from the telephone line. In the speech between sub-units by the press-to-talk system, signals representing start and end of the speech are generated by the sub-unit to control holding and release of an external telephone line of a master unit repeater so that speech with the external line is restored immediately after the end of the speech between the sub-units. When one sub-uni…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.