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Paging system with transmission protocol compatible with analog and digital transmitters

  • US 4,875,039 A
  • Filed: 02/22/1988
  • Issued: 10/17/1989
  • Est. Priority Date: 02/22/1988
  • Status: Expired due to Term
First Claim
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1. A paging system comprising:

  • (a) a transmitter for transmitting pages which are comprised of characters with the characters of each page modulating a carrier which is broadcast by the transmitter, the transmitter utilizing one of an analog transmission protocol or a digital transmission protocol to transmit other pages and a transmission protocol different from the analog or digital transmission protocol but compatible with the transmitter being used to transmit other pages with the analog or digital transmission protocols;

    (b) means for receiving pages to be broadcast by the transmitter;

    (c) a memory, coupled to the means for receiving, for storing the received pages to be broadcast; and

    (d) control means, coupled to the memory and to the transmitter, for encoding each character of each page with the different transmission protocol by utilizing a plurality of frequencies each encoding a different value with each character being encoded with at least one value and for providing the encoded characters in a page to the transmitter for broadcast by the transmitter.

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