Kidd, Moray and Shi, John Z. (2008) Signal detection. WO2008139134.Metadata only available from this repository.
According to an asupect of the present invention, there is provided a method of detecting an abnormal signal in a compound sampled signal recorded in the time domain, the method comprising: dividing the sampled signal recorded in the time domain into a plurality of sample segments; transforming each of the plurality of the sample segments from the time domain into the frequency domain to determine a plurality of transformed sample segments, each transformed sample segment having a plurality of frequency points, each frequency point having an amplitude associated with a certain frequency; for a frequency point in a given 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 frequency points at the same frequency across a plurality of transformed sample segments; repeating the determination of a ratio for a plurality of frequency points in each transformed sample segment to determine a plurality of ratios for each transformed sample segment; repeating the determination of a plurality of ratios for a plurality of transformed sample segments; and using the ratios to detect the abnormal signal in the compound sampled signal.
|Subjects:||T Technology > TL Motor vehicles. Aeronautics. Astronautics|
|Schools:||School of Computing and Engineering > Automotive Engineering Research Group|
School of Computing and Engineering
School of Computing and Engineering > Diagnostic Engineering Research Centre
School of Computing and Engineering > Diagnostic Engineering Research Centre > Measurement System and Signal Processing Research Group
|Depositing User:||Zhanqun Shi|
|Date Deposited:||18 Jun 2009 10:17|
|Last Modified:||08 Dec 2010 13:49|
Repository Staff Only: item control page