When {HEAD ~ an input signal} of {TAIL ~ a low level} is outside of the lock range characteristic of the phase locked loop, a voltage controlled oscillator of the phase locked loop oscillates at a predetermined frequency 
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When { HEAD ~ an input signal } of { TAIL ~ a low level } is outside of the lock range characteristic of the phase locked loop , a voltage controlled oscillator of the phase locked loop oscillates at a predetermined frequency
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH