Fitzpatrick, Cella, Harper & Scinto
Phase-locked signal generator
 A phase-locked signal generator for generating a clock signal phase-locked with an external input trigger signal comprises means for generating a period signal having a frequency equal to that of a clock signal to be output, means for comparing the period signal with a plurality of reference levels different from each other, memory means for storing a comparison result from the comparing means in synchronism with an input of the trigger signal, and arithmetic means for logically operating the comparison result output from the comparing means on the basis of the comparison result stored in the memory means. 
Canon Kabushiki Kaisha
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Somei Hiroyuki Masami
Kawasaki Mizuno Iseki