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Paging system which combines a paging signal with a standard broadcast baseband signal

  • US 5,642,397 A
  • Filed: 07/19/1994
  • Issued: 06/24/1997
  • Est. Priority Date: 05/01/1991
  • Status: Expired due to Fees
First Claim
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1. A paging system for providing a paging signal combined with a standard broadcast baseband signal for simultaneous transmission over an existing broadcast system, said paging system comprising:

  • a receiver for receiving a standard broadcast signal transmitted from a broadcast system and providing a demodulated pager message signal, said standard broadcast signal including a single standard broadcast baseband signal and a pager signal;

    a frequency analyzer for extracting a hopped pager message signal from said demodulated pager message signal;

    a subtractor for subtracting a modulo-2k PN-coded signal representing the address of a particular pager from said hopped pager message signal of said frequency analyzer to detect the presence of a hopped sequence associated with the address of said particular pager, if there is match between said hopped sequence and the fixed sequence of said particular pager then the demodulated hopped message signal associated with the sequence is provided to a decoder, said decoder decodes the received hopped message signal and a decoded message signal is provided to an output device; and

    a transmitter for generating said pager message signal, said pager message signal including the address of a destination pager and the contents of the message in a format where the destination address is provided by the hopping sequence associated with the destination pager and the contents of the message is included in the pager message signal.

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