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Distributed database system and database receiver thereof

  • US 5,999,934 A
  • Filed: 04/03/1998
  • Issued: 12/07/1999
  • Est. Priority Date: 11/27/1992
  • Status: Expired due to Term
First Claim
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1. A distributed database system comprising:

  • a central station for accumulating and distributing data on a database, said central station comprising;

    a data store for storing accumulated data from said database, ready for distribution;

    processing means for extracting said data from said data store and generating a sequential data stream therewith for distribution; and

    transmission means for encoding and transmitting said sequential data stream; and

    a plurality of receiver stations for receiving said data and selectively making available at least portions of said data in accordance with the demands of a user of a said receiver station, each of said receiver stations comprises;

    decoder means to receive and decode transmitted data so as to reconstitute said database data therefrom;

    input means for the user of said receiver station to input user commands in respect of the demands of the user to said receiver station;

    receiver processing means for constituting a database from said data having regard to said user commands;

    memory means for storing data for constituting said database; and

    means for communicating selected data in direct response to said user commands;

    wherein said decoder means includes;

    data acquisition means for extracting a serial data stream and a synchronization signal from the transmitted data;

    a data decoder to filter out data control information from said serial data stream and reconstitute said database data; and

    transfer means to continuously transfer a stream of reconstituted data to said receiver processing means, andwherein said receiver processing means includes;

    further decoder means to examine said stream of reconstituted data and extract index data therefrom; and

    database handling means to determine storage of individual database data in accordance with a prescribed algorithm,whereby in response to a decision to store or update said individual database data, said database handling means is adapted to transfer said individual database data to a requisite storage location in said memory means and perform contingency action according to said prescribed algorithm involving changing the structure of said database so as to continuously constitute said database.

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