Waveform disturbance detection apparatus and method

Claim 2

A waveform disturbance detection apparatus for detecting disturbances in an alternating current electromagnetic energy waveform, said alternating current electromagnetic energy waveform having a plurality of periodic, normally similar cycles, comprising converter means for obtaining a plurality of samples from consecutive cycles of said electromagnetic energy waveform; and processing means for comparing samples from a selected cycle of the consecutive cycles with corresponding samples from a reference cycle to detect disturbances in said electromagnetic energy waveform, wherein the reference cycle is the cycle which immediately preceded the selected cycle, so that the reference cycle used changes as a different one of the consecutive cycles is selected for processing.

Claim 3

The waveform disturbance detection apparatus as claimed in claim 1, wherein the converter means further includes means for converting the plurality of samples into digital signals, and further wherein said processing means performs the comparison of samples by comparing the digital signals corresponding to the samples being compared, the processing means further including buffer means for storing a plurality of said corresponding digital signals from the reference cycle.

Claim 4

The waveform disturbance detection apparatus as claimed in claim 2, wherein in said processing means a disturbance is deemed to have occurred when the difference between a sample from the selected cycle and a corresponding sample from the reference cycle exceeds a predetermined tolerance range, the processing means further comprising disturbance counter means for counting the number of said disturbances.

Claim 5

The waveform disturbance detection apparatus as claimed in claim 3, wherein said disturbance counter means is re-initialized when the sample from the selected cycle is within said predetermined tolerance range.

Claim 6

The waveform disturbance detection apparatus as claimed in claim 2, 3 or 4, wherein said processing means replaces said corresponding digital signals contained in said buffer means with the digital signals corresponding to the samples of the selected cycle, so that the selected cycle becomes the reference cycle for the next cycle to be evaluated.

Claim 7

The waveform disturbance detection apparatus as claimed in claim 5, wherein said processing means further comprises post-disturbance buffer means for storing samples from at least one of said consecutive cycles that follows a selected cycle in which the number of disturbances exceed a predetermined limit of said disturbances.

Claim 8

The waveform disturbance detection apparatus as claimed in claim 6, further comprises recorder/display means for recording and displaying said disturbances.

Claim 9

The waveform disturbance detection apparatus as claimed in claim 2, 3 or 4, wherein said processing means replaces said corresponding digital signal contained in said buffer means with the digital signals corresponding to the samples of the selected cycle when said digital samples corresponding to the samples of the selected cycle are within said predetermined tolerance range.

Claim 10

The waveform disturbance detection apparatus as claimed in claim 8, wherein said processing means further comprises post-disturbance buffer means for storing samples from at least one of said consecutive cycles that follows a selected cycle in which the number of disturbances exceed a predetermined limit of said disturbances.

Claim 11

The waveform disturbance detection apparatus as claimed in claim 9, further comprises recorder/display means for recording and displaying said disturbances.

Claim 12

A waveform disturbance detection apparatus for detecting disturbances in alternating current electromagnetic energy waveform, said alternating current electromagnetic energy waveform having a plurality of periodic, substantially similar cycles, comprising attenuator means for attenuating said electromagnetic energy waveform, thereby generating an attenuated electromagnetic energy waveform; amplifier means for amplifying said attenuated electromagnetic energy waveform, thereby generating a modified electromagnetic energy waveform; analog to digital converter means for sampling said modified electromagnetic energy waveform, generating a plurality of samples, and converting said samples into digital signals; and processing means for evaluating said digital signals so as to detect disturbances in said electromagnetic energy waveform, wherein said processing means detects said disturbances by comparing a particular one of said digital signals that represents a particular one of said samples in a particular current one of said cycles with a corresponding one of said digital signals that represents a corresponding one of said samples from an immediately preceding one of said cycles, said processing means comprises buffer means for storing a plurality of said corresponding digital signals, wherein each of said corresponding digital signals is from said immediately preceding cycle, whereby said particular current digital signal is compared with said corresponding digital signal from said immediately preceding cycle; and disturbance counter means for counting the number of said disturbances, wherein said counter means is incremented when said particular digital signal representing said particular sample exceeds a predetermined tolerance range.

Claim 13

A waveform disturbance detection apparatus for detecting disturbances in alternating current electromagnetic energy waveform, said alternating current electromagnetic energy waveform having a plurality of periodic, substantially similar cycles, comprising attenuator means for attenuating said electromagnetic energy waveform, thereby generating an attenuated electromagnetic energy waveform; amplifier means for amplifying said attenuated electromagnetic energy waveform, thereby generating a modified electromagnetic energy waveform; analog to digital converter means for sampling said modified electromagnetic energy waveform, generating a plurality of samples, and converting said samples into digital signals; and processing means for evaluating said digital signals so as to detect disturbances in said electromagnetic energy waveform, wherein said processing means detects said disturbances by comparing a particular one of said digital signals that represents a particular one of said samples in a particular current one of said cycles with a corresponding one of said digital signals that represents a corresponding one of said samples from an immediately preceding one of said cycles, said processing means comprises buffer means for storing a plurality of said corresponding digital signals, wherein each of said corresponding digital signals is from said immediately preceding cycle, whereby said particular current digital signal is compared with said corresponding digital signal from said immediately preceding cycle; and disturbance counter means for counting the number of said disturbances, wherein said counter means is incremented when said particular digital signal representing said particular sample exceeds a predetermined tolerance range.

Claim 14

The waveform disturbance detection apparatus as claimed in claim 11, wherein said disturbance counter means is re-initialized when said particular digital signal is within said predetermined tolerance range.

Claim 15

The waveform disturbance detection apparatus as claimed in claim 11 or 12, wherein said processing means replaces said corresponding digital signal from said immediately preceding cycle contained in said buffer means with said particular current digital signal.

Claim 16

The waveform disturbance detection apparatus as claimed in claim 13, wherein said processing means further comprises post-disturbance buffer means for storing said digital signals of at least one of said cycles that follows said particular current cycle in which the number of disturbances exceed a predetermined limit of said disturbances.

Claim 17

The waveform disturbance detection apparatus as claimed in claim 14, further comprises recorder/display means for recording and displaying said disturbances.

Claim 18

The waveform disturbance detection apparatus as claimed in claim 11 or 12, wherein said processing means replaces said corresponding digital signal from said immediately preceding cycle contained in said buffer means with said particular current digital signal when said particular current digital signal is within said predetermined tolerance range.

Claim 19

The waveform disturbance detection apparatus as claimed in claim 16, wherein said processing means further comprises post-disturbance buffer means for storing said digital signals of at least one of said consecutive cycles that follows said particular current cycle in which the number of disturbances exceed a predetermined limit of said disturbances.

Claim 20

The waveform disturbance detection apparatus as claimed in claim 17, further comprises recorder/display means for recording and displaying said disturbances.

Claim 23

The method of detecting waveform disturbances as claimed in claim 19, further comprises replacing said stored, corresponding digital signal with said particular digital signal.

Claim 24

The method of detecting waveform disturbances as claimed in claim 19 or 20, further comprising restarting the counting of said disturbances from zero when said disturbances for said particular cycle is within a predetermined limit to permit recounting of future said disturbances in a future said particular cycle.

Claim 25

The method of detecting waveform disturbances as claimed in claim 21, further comprises storing said digital signals of at least one of said cycles that follows said particular cycle in which the number of disturbances exceed a predetermined limit of said disturbances.

Claim 26

The method of detecting waveform disturbances as claimed in claim 22, further comprises recording and displaying said disturbances.

Claim 27

The method of detecting waveform disturbances as claimed in claim 19, further comprises replacing said stored, corresponding digital signal with said particular digital signal when said particular digital signal is within said predetermined tolerance range.

Claim 28

The method of detecting waveform disturbances as claimed in claim 24, further comprises restarting the counting of said disturbances from zero when said disturbances for said particular cycle is within a predetermined limit to permit recounting of future said disturbances in a future said particular cycle.

Claim 29

The method of detecting waveform disturbances as claimed in claim 25, further comprises storing said digital signals of at least one of said cycles that follows said particular cycle in which the number of disturbances exceed a predetermined limit of said disturbances.

Claim 30

The method of detecting waveform disturbances as claimed in claim 26, further comprises recording and displaying said disturbances.

Claim 33

The method of detecting waveform disturbances as claimed in claim 28, wherein said processing step further comprises replacing said stored, corresponding digital signal from said immediately preceding cycle with said particular digital signal from said particular current cycle.

Claim 34

The method of detecting waveform disturbances as claimed in claim 28 or 29, wherein said processing step further comprises restarting the counting of said disturbances when said count of said disturbances for said particular cycle is within a predetermined limit to permit recounting of future said disturbances in a future said particular cycle.

Claim 35

The method of detecting waveform disturbances as claimed in claim 30, wherein said processing step further comprises storing said digital signals of at least one of said cycles that follows a particular current cycle in which the count exceeds said predetermined limit of said disturbances.

Claim 36

The method of detecting waveform disturbances as claimed in claim 31, further comprises recording and displaying said disturbances.

Claim 37

The method of detecting waveform disturbances as claimed in claim 28, wherein said processing step further comprises replacing said stored preceding, corresponding digital signal from said immediately preceding cycle with said particular digital signal from said current cycle when said particular digital signal is within said predetermined tolerance range.

Claim 38

The method of detecting waveform disturbances as claimed in claim 33, wherein said processing step further comprises restarting the counting of said disturbances when said count of disturbances for said particular cycle is within a predetermined limit to permit recounting of future said disturbances in a future said particular cycle.

Claim 39

The method of detecting waveform disturbances as claimed in claim 34, wherein said processing step further comprises storing said digital signals of at least one of said cycles that follows said particular current cycle in which the count exceeded a predetermined limit of said disturbances.

Claim 40

The method of detecting waveform disturbances as claimed in claim 35, further comprises recording and displaying said disturbances.

Claim 41

A waveshape variance detection apparatus for detecting variances in the shape of a waveform, said waveform having a plurality of periodic, substantially similar cycles, comprising converter means for sampling said waveform, generating a plurality of samples, and converting said samples into digital signals; and processing means for evaluating said digital signals so as to detect said variances, wherein said processing means detects said variances by comparing a particular one of said digital signals that represents a particular one of said samples in a particular one of said cycles with a corresponding one of said digital signals that represents a corresponding one of said samples from an immediately preceding one of said cycles.

Claim 42

A waveshape variance detection apparatus for detecting variances in the shape of a waveform, said waveform having a plurality of periodic, substantially similar cycles, comprising converter means for sampling said waveform, generating a plurality of samples, and converting said samples into digital signals; and processing means for evaluating said digital signals so as to detect said variances, wherein said processing means detects said variances by comparing a particular one of said digital signals that represents a particular one of said samples in a particular one of said cycles with a corresponding one of said digital signals that represents a corresponding one of said samples from an immediately preceding one of said cycles.

Claim 43

The waveshape variance detection apparatus as claimed in claim 37, wherein said processing means comprises buffer means for storing a plurality of said corresponding digital signals, wherein each of said corresponding digital signals is from said immediately preceding cycle, whereby said particular digital signal is compared with said corresponding digital signal.

Claim 44

The waveshape variance detection apparatus as claimed in claim 38, wherein said processing means further comprises variance counter means for counting the number of said variances, wherein said counter means is incremented when said particular digital signal representing said particular sample exceeds a predetermined tolerance range.

Claim 45

The waveshape variance detection apparatus as claimed in claim 39, wherein said variance counter means is re-initialized when said particular digital signal is within said predetermined tolerance range.

Claim 46

The waveshape variance detection apparatus as claimed in claim 38, 39 or 40, wherein said processing means replaces said corresponding digital signal contained in said buffer means with said particular digital signal.

Claim 47

The waveshape variance detection apparatus as claimed in claim 41, wherein said processing means further comprises post-variance buffer means for storing said digital signals of at least one of said cycles that follows said particular cycle in which the number of variances exceeds a predetermined limit of said variances.

Claim 48

The waveshape variance detection apparatus as claimed in claim 42, further comprises recorder/display means for recording and displaying said variances.

Claim 51

The method of detecting waveshape variances as claimed in claim 44, further comprises replacing said stored, corresponding digital signal from said immediately preceding cycle with said particular digital signal from said particular one of said cycles.

Claim 52

The method of detecting waveshape variances as claimed in claim 44 or 45, further comprises restarting the counting of said variances when the number of said variances for said particular cycle is within a predetermined limit to permit recounting of future said variances in a future said particular cycle.

Claim 53

The method of detecting waveshape variances as claimed in claim 46, further comprises storing said digital signals of at least one of said cycles that follows said particular cycle in which the number of variances exceeded a predetermined limit of said variances.

Claim 54

The method of detecting waveshape variances as claimed in claim 47, further comprises recording and displaying said variances.

Claim 55

A waveform disturbance detection apparatus for detecting disturbances in an alternating waveform having periodic, normally similar cycles, comprising means for obtaining consecutive samples from a current cycle of the waveform; means for storing consecutive reference samples from a reference cycle, wherein the reference cycle is the cycle which immediately preceded the current cycle of the waveform; means for comparing each of the consecutive samples from the current cycle, as each consecutive sample is obtained, to a corresponding one of the reference samples stored in the storing means to detect whether a disturbance is present in the waveform; and means for replacing each of the reference samples stored in the storing means with the corresponding sample from the current cycle against which it was compared, so that the reference samples in the storing means are updated each time a sample from the current cycle is evaluated.

Claim 56

A waveform disturbance detection apparatus for detecting disturbances in an alternating waveform having periodic, normally similar cycles, comprising means for obtaining consecutive samples from a current cycle of the waveform; means for storing consecutive reference samples from a reference cycle, wherein the reference cycle is the cycle which immediately preceded the current cycle of the waveform; means for comparing each of the consecutive samples from the current cycle, as each consecutive sample is obtained, to a corresponding one of the reference samples stored in the storing means to detect whether a disturbance is present in the waveform; and means for replacing each of the reference samples stored in the storing means with the corresponding sample from the current cycle against which it was compared, so that the reference samples in the storing means are updated each time a sample from the current cycle is evaluated.