| http://www.w3.org/ns/prov#value | - output signal SN of frequency fN =(fVCO ???fAS)/N, where N is an integer, means for generating a first reference signal SR1 of frequency fR1, and phase detecting means for comparing the phase of said signals of SN and SR1 to produce a control signal Ec, said VCO responsive to Ec to alter its frequency output so that fN =fR1 ;means for generating a second reference signal SR2 of frequency fR2 where
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