Characterizing newly acquired waveforms for identification of waveform anomalies
First Claim
1. A method of characterizing a newly acquired waveform with respect to previously acquired waveforms during monitoring of a generally repetitive signal, comprising the steps of:
- for each of a plurality of positions within a two-dimensional array associated with the newly acquired waveform, reading a history value representing the previously acquired waveforms which is associated with the position;
incrementing a count of one of a plurality of counters having a history value range corresponding to the history value, each counter having a different history value range;
modifying the history value to produce a new history value;
writing the new history value into the position as the history value; and
determining from the counts of the counters, after all the positions associated with the newly acquired waveform have been processed, a variability of the newly acquired waveform with respect to the previously acquired waveforms.
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Abstract
A method of characterizing a newly acquired waveform with respect to previously acquired waveforms during monitoring of a generally repetitive signal, where the previously acquired waveforms have been rasterized into a two-dimensional array of memory locations, reads history values for those memory locations associated with an active portion of the newly acquired waveform, compares the history values with history value ranges, increments a count for one of a plurality of recent pixel counters corresponding to the history value ranges, each counter having a different history value range, and modifies the history values in the memory locations. From the counts accumulated for each of the history value ranges the variability of the newly acquired waveform from the generally repetitive signal is determined.
18 Citations
18 Claims
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1. A method of characterizing a newly acquired waveform with respect to previously acquired waveforms during monitoring of a generally repetitive signal, comprising the steps of:
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for each of a plurality of positions within a two-dimensional array associated with the newly acquired waveform, reading a history value representing the previously acquired waveforms which is associated with the position;
incrementing a count of one of a plurality of counters having a history value range corresponding to the history value, each counter having a different history value range;
modifying the history value to produce a new history value;
writing the new history value into the position as the history value; and
determining from the counts of the counters, after all the positions associated with the newly acquired waveform have been processed, a variability of the newly acquired waveform with respect to the previously acquired waveforms. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method comprising the steps of:
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rasterizing data associated with a generally repetitive signal to derive therefrom a sequence of waveforms, each waveform having associated with it a plurality of positions within a two-dimensional array;
comparing successive waveforms to produce a difference waveform; and
determining from the difference waveform whether an anomalous waveform associated with the generally repetitive signal has been rasterized. - View Dependent Claims (9, 10, 11)
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12. Apparatus for characterizing a newly acquired waveform with respect to previously acquired waveforms during monitoring of a generally repetitive signal, comprising:
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a raster memory for storing as a two dimensional array successive waveforms acquired from the generally repetitive signal, where a history value for each location in the two dimensional array represents the previously acquired waveforms;
a plurality of counters, each of the counters having a respective history value range and each producing a count that is incremented in response to the locations in the two dimensional array corresponding to the newly acquired waveform which have history values within the respective history value ranges; and
means for analyzing the counts to determine a variability of the newly acquired waveform with respect to the previously acquired waveforms. - View Dependent Claims (13, 14, 15, 16)
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- 17. An improved apparatus for characterizing variabilites in a nominally repetitive waveform signal, the improved apparatus being of the type having means for acquiring a sequence of waveforms from the nominally repetitive waveform signal, means for rasterizing each acquired waveform of the sequence of waveforms into a raster memory, means for identifying new points of each newly acquired waveform with respect to previously acquired waveforms, and means for counting the new points for each acquired waveform to identify an anomalous waveform, wherein the improvement comprises means for analyzing a history of the previously acquired waveforms for each newly acquired waveform, as represented by history values in the raster memory associated with the newly acquired waveform, across a plurality of history value ranges to characterize the variabilities.
Specification