发明名称 |
CELLULAR TELEPHONE WITH PAGER |
摘要 |
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 single frequency, thereby eliminating frequency scanning by the pager or manual updates by the user.
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申请公布号 |
US5247700(A) |
申请公布日期 |
1993.09.21 |
申请号 |
US19900614302 |
申请日期 |
1990.11.16 |
申请人 |
UNIVERSAL CELLULAR, INC. |
发明人 |
WOHL, JAMES P.;NAUGLER, JR., W. EDWARD;HENDERSHOT, JAMES;LLOYD, GRAHAM P.;ADAMS, ERICH B. |
分类号 |
G08B5/22;H04M1/02;H04W84/02;H04W88/02 |
主分类号 |
G08B5/22 |
代理机构 |
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