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Abstract
The recurrence frequency of coincidence of two sets of pulses has been discussed. It has been shown that when the pulses are very narrow the frequency of coincidence is irregular, but when the pulses are broad the irregularity vanishes if the two frequencies do not differ widely. Coincidence is then found to occur in groups, the number in each group depending upon the width of the broad pulses. The number of groups of coincidences is further found to correspond to the difference between the frequencies of the two sets of pulses. When the two frequencies are not very close but a harmonic of one is close to another harmonic of the other, coincidence may again occur in groups if these harmonics are not of high order. The group frequency is different from the difference between the frequencies of the two harmonics. The application of this principle of pulse coincidence to measurement of pulse recurrence frequency is finally discussed.