公开(公告)号：US09772368B2

公开(公告)日：2017-09-26

申请号：US13693849

申请日：2012-12-04

Applicant: Bosch Automotive Service Solutions Inc.

Inventor： Moray Kidd ,  Zhanqun Shi

IPC: G01R31/08 ,  G01H3/08 ,  G06F15/00

CPC classification number: G01R31/08 ,  G01H3/08 ,  G06F15/00

Abstract: A technique detects an abnormal signal in a compound sampled signal recorded in the time domain. The technique involves dividing the sampled signal recorded in the time domain into sample segments; transforming each of the sample segments from the time domain into the frequency domain to determine transformed segments, each transformed segment having frequency points, each frequency point having an amplitude associated with a certain frequency; for a frequency point in a given transformed segment, determining a ratio by dividing the amplitude of the frequency point by a value indicative of an average of the amplitudes of the frequency points at the same frequency across transformed segments; repeating the determination of a ratio for frequency points in each transformed segment to determine ratios for each transformed segment; repeating the determination of ratios for transformed segments; and using the ratios to detect the abnormal signal in the compound sampled signal.