Data communication system with key data bits denoting...

Details Data communication system with key data bits denoting... Data communication system with key data bits denoting...

H - Electricity

04

Q

340/86

H04Q 9/00 (2006.01) G08B 25/04 (2006.01) H04Q 9/14 (2006.01)

Patent

CA 1252536

DATA COMMUNICATION SYSTEM WITH KEY DATA BIT DENOTING SIGNIFICANCE OF OTHER DATA BITS ABSTRACT: A communications system includes a transmitter for sending successive composite signals, each of which has successive segments which represent different data. A composite signal can be a pulse group with the segments denoted by individual pulses. A plurality of receivers are connected to receive the successive composite signals and recognize the data in each signal. Part of the transmitted composite signal is encoded by modifying at least one segment of a given composite signal in a predetermined manner. When an addressed receiver detects the encoded data or key in the composite signal, the receiver assigns a different significance to data in the remainder of that composite signal, and/or in at least one other composite signal. If the key is present in the next successive transmission, yet another signi- ficance is assigned to the data.

502544

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