Patent ID: 8537359
Filing Date: 2013-09-17
Classification: B23Q

Abstract:
1. An object detector apparatus, comprising: a receiver configured to receive a signal from an object having a repetitive motion, the signal repeating at a frequency that is dependent on the frequency of the repetitive motion of the object; and an analyser configured to sample a signal from the object received by the receiver according to a first set of sampling parameters into a first sampled data set, and to produce an output based on a comparison of the first sampled data set with at least one previously sampled data set; wherein the analyser is configured to sample a signal from the same object received by the receiver using a second set of sampling parameters which differs from the first set of sampling parameters into a second sampled data set, and to produce an output based on a comparison of the second sampled data set with at least one previously sampled data set, and the output based on the comparison of the first sampled data set with the at least one previously sampled data set, and the output based on the comparison of the second sampled data set with the at least one previously sampled data set, are used in determining whether the object has been detected.