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Radio pager having local- and wide-area reception modes

  • US 4,910,511 A
  • Filed: 04/04/1986
  • Issued: 03/20/1990
  • Est. Priority Date: 04/06/1985
  • Status: Expired due to Term
First Claim
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1. A radio pager comprising:

  • manually controlled channel selecting means for selecting a first channel to operate the pager in a local area reception mode and for selecting a second channel to operate the pager in a wide area reception mode;

    receiving means responsive to said channel selecting means for receiving a first paging signal which is transmitted on the first channel and for receiving a second paging signal transmitted on the second channel, said first paging signal containing an address in a Bose-Chaudhuri-Hocquenghem ("BCH") (L, M) code format and said second paging signal containing an address in a BCH (L, N) code format, where L>

    N>

    M;

    a shift register having L-bit positions in which the address of either the received first or second paging signal is sequentially stored;

    first and second memories respectively operable during said local area reception mode and wide area reception mode, said first and second memories having L-bit memory elements coupled respectively to the L-bit positions of said shift register and memorizing a user'"'"'s first identification number in said BCH (L,M) code format and a user'"'"'s second identification number in said BCH (L,N) code format, respectively, and for generating a coincidence signal as an indication of a reception of said first or second paging signal when the address stored in said shift register coincides with one of said user'"'"'s identification numbers in said first and second memories;

    a first error correction circuit which is operable during said local area reception mode for providing "i"-bit error correction of the address of said first paging signal; and

    a second error correction circuit which is operable during said wide area reception mode for providing "j"-bit error correction of the address of said second paging signal, where "j" is smaller than "i".

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