Patent ID: 7719256

Claim:
A method for detecting an occurrence of a leading edge of a cyclic input pulse of a series of cyclic input pulses, comprising: (a) taking a sample of cyclic input pulses at each of a series of sampling times, the sampling times being separated from each other by a single fixed time interval, each sampling time of the series of sampling times having a count number, the count numbers being in successive order; (b) detecting sampling hits, each sampling hit being an indication of a presence of a cyclic input pulse; (c) recording the count number at each of the sampling hits; (d) determining initial sampling hits from the detected sampling hits; (e) determining a minimum sampling interval between initial sampling hits; and (f) determining a count number located at a back end of the minimum sampling interval, the count number located at the back end of the minimum sampling interval being an indication of the occurrence of a lead edge of a cyclic input pulse.