Cellular telephone with pager
US5247700A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 16, 1990 |
| Grant date | Sep 21, 1993 |
| Priority date | — |
| Expiry date | Nov 16, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M1/0235
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A compact and unitary cellular/pager. The cellular/pager includes a cellular antenna for receiving UHF cellular and paging signals. The cellular/pager also includes a VHF paging antenna. Every paging signal is sent to a paging receiver. The paging receiver uses the same circuitry to process either the UHF or VHF page. This is accomplished by setting a voltage controlled oscillator (VCO) to one of two frequency ranges. The chosen frequency is either added or subtracted to the incoming signal in order to match a constant intermediate frequency. The resultant signal is demodulated and a bit rate is selected by a decoder, under the control of a microprocessor. Therefore, the paging receiver can choose a band, a channel and a bit rate. Cellular signals are sent to a cellular block. Cellular location information is utilized by the cellular/pager to form an internally updated roaming pager. That is, the cellular location information is automatically conveyed by the cellular block, under the control of the microprocessor, to a paging service. The paging service then knows the location of the paging receiver, consequently the paging service can direct the pager to await for a page at a sing…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.