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Method and device for selecting information usable by a local unit connected to a digital transmission system

  • US 5,428,650 A
  • Filed: 04/23/1992
  • Issued: 06/27/1995
  • Est. Priority Date: 05/07/1991
  • Status: Expired due to Term
First Claim
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1. Method of selecting digital information to be transmitted to a local unit originating from at least one independent transmission line and in the form of messages sent sequentially and organized in such a way as to comprise useful information preceded in time by selection information, the method including the following steps:

  • cyclical scanning at a fixed frequency of a programmed list of conditions in memory;

    simultaneous acquisition of information on said transmission line;

    activation of a selection process each time that the selection information of a message received on said transmission line has been acquired, the selection process including a synchronization stage which waits for the scanning process to cross the start of said list of conditions, a comparison (pattern matching) sequence on the selection information contained in the message being received, and a production of a selection variable which indicates if the message being received is of interest to said local unit or not, the selection process ending either when all the conditions from said list have been exhausted and on returning to the start of list condition or upon reading a special end of list code;

    memorization of messages selected in a buffer accessible to said local unit.

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