| http://www.w3.org/ns/prov#value | - quency which is equal to a difference in frequencies of a reference clock signal and a target clock signal, dividing the reference clock signal by N, where N is an integer, to generate a divided reference-clock signal, and obtaining a polarity of a difference between the frequencies of the beat waveform signal and the divided reference-clock signal, and generating a step out alarm signal which is
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