Patent ID: 7085686
Filing Date: 2006-08-01
Classification: H03M

Abstract:
1. A signal processing method comprising: logging phase angle data sampled at a first sampling rate to generate a sampled phase angle signal having a plurality of sampled data points; sub-sampling the sampled phase angle signal at a second sampling rate to generate a sub-sampled phase angle signal having a plurality of sub-sampled data points, the plurality of sub-sampled data points comprising a sub-set of the plurality of sampled data points; transforming the sub-sampled phase angle signal by subtracting each of the plurality of sub-sampled data points from 90 degrees to generate a transformed phase angle signal having a plurality of transformed data points, the plurality of transformed data points being equal in number to the plurality of sub-sampled data points; convoluting the transformed phase angle signal with a wavelet signal to generate a convoluted phase angle signal having a plurality of convoluted data points, the plurality of convoluted data points being equal in number to the plurality of transformed data points; calculating the range between the smallest and largest convoluted data point within each of a plurality of segments of the convoluted phase angle signal to generate a phase angle range signal having a plurality of phase angle range data points, the plurality of phase angle range data points being lesser in number than the plurality of convoluted data points; and performing a moving average calculation on the phase angle range signal to generate a moving average signal having a plurality of moving average data points, the plurality of moving average data points being equal in number to the plurality of phase angle range data points.