Patent ID: 6208951
Filing Date: 2001-03-27
Classification: G06T

Abstract:
A method for the identification and/or separation of composite signals obtained from an apparatus/equipment recording the variations in a system property as sequential or time-series data, from the said apparatus/equipment, into its deterministic(true signal) and noisy parts, comprising the steps of:(a) obtaining a signal to be identified and/or separated from an apparatus/equipment;(b) digitizing the said composite signal, obtained as sequential or time-series data, relating to a variation in a system property;(c) computing and subjecting the said digitized data obtained from step (b) above to wavelet transform to obtain a scalogram in terms of wavelet coefficients;(d) computing and organizing the said resulting wavelet coefficients in each of the scales to form new sets of data;(e) computing for taking each of the above said data sets and carry out their wavelet transform to obtain another scalogram in terms of wavelet coefficients;(f) computing for implementing steps (d) and (e), recursively with testing for the constancy in the power distribution, (the said power distribution being the ratio of the power in a particular scale with respect to the total power in all the scales of that scalogram for two consecutive recursive scalograms) and thereby identifying the recursive wavelet scales contributing to noise in the signal;(g) eliminating the above said wavelet coefficients in the recursive wavelet scales contributing to noise by setting term to zero; and(h) inverting the above said wavelet coefficients by inverse recursive wavelet transformation and thereby determining the deterministic signal component (true signal) separated from the noise component.