JPS567157A - Time information transfer system - Google Patents

Abstract

PURPOSE: To prevent the extraction of the wrong time information into the time receiver, by adding the check information to the time generator and then giving the check to the justice of the time information through the time receiver and based on the time information and the check information.

CONSTITUTION: Time information generating circuit 10 in time generator 1 generates time information 100 of the standard value of real time to plural number of time receiver 2. Check information generating circuit 11 generates check information 101 based on information 100. And effective display generating circuit 12 changes effective display signal 102 to logic 1 when generator 1 is normal, and then changes signal 102 to logic 0 in case generator 1 is faulty each. Check circuit 20 in receiver 2 checks whether the contents of information 100 is correct or not based on information 100 and 101. And when the contents is correct, error signal 103 is turned to logic 1; while signal 103 is changed t logic 0 when the contents is not correct each. The logic product of logic product gate 21 changes the state of effective display signal 104 according to the state of signals 102 and 103 each. And only when both signals 102 and 103 are logic 1, information 100 is taken into input register 22.

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