The method involves comparing an incoming reference signal with the signal of a real time feed, feeding the output signal of the comparator via AND combinations with the reference signal to a binary counter and incrementing/decrementing it according to the result of the comparison. The output of the binary counter is fed to one input of a cyclic adder whose carry is input to the time trigger of a real time counter with another input from a register for the signal generated by the cyclic adder.
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