Patent ID: 6408696
Filing Date: 2002-06-25
Classification: G01H,G01R

Abstract:
A method for detecting a periodic signal buried in wide-band noise in a signal using a CPLE power spectral density plot, comprising the steps of:(a) segmenting the signal into a plurality of adjacent, equal-size, block signals; (b) performing a first Discrete Fourier Transform on each block signal to obtain an ensemble of frequency signals, each frequency signal including complex data associated with frequency components; (c) defining a complex frequency-time signal for each frequency component using the complex data from each frequency signal; (d) performing a second Discrete Fourier Transform on each complex frequency-time signal to obtain an equivalent wave number signal for each frequency component; (e) identifying a peak magnitude component for each equivalent wave number signal associated with each frequency component; (f) defining a window around each peak magnitude component for each frequency component; (g) calculating a window power for each frequency component; (h) displaying the window power for each frequency component to obtain the CPLE power spectral density plot of the signal, wherein a peak component in the CPLE power spectral density plot represents the periodic signal.