Patent Document ID: 8326557
Application ID: 12615643
Patent Status: 1

Claim One:
1. A computer-implemented method of detecting an abnormal signal in a compound sampled signal recorded in time domain, the method comprising: dividing the sampled signal recorded in the time domain into a plurality of sample segments; transforming, via a computer processor, each of the plurality of the sample segments from the time domain into frequency domain to determine a plurality of transformed sample segments, each of the plurality of transformed sample segments having a plurality of frequency points, each of the plurality of frequency points having an amplitude associated with a certain frequency; for a frequency point in the transformed sample segment, determining a ratio by dividing the amplitude of the frequency point by a value indicative of an average of the amplitudes of the plurality of frequency points at same frequency across the plurality of transformed sample segments; repeating the determination of a ratio for the plurality of frequency points in each of the plurality of transformed sample segments to determine a plurality of ratios for each of the plurality of transformed sample segments; repeating the determination of the plurality of ratios for the plurality of transformed sample segments; and determining the abnormal signal in the compound sampled signal based on the plurality of ratios.