Signal analysis method using the Walsh transform

摘要

PURPOSE:To speedily and accurately extract a change in the state of a system, etc., by calculating the index in a sequence area according to fast Walsh transformation and detecting its variation. CONSTITUTION:The time history signal of a signal to be analyzed is Walsh- transformed WT (101) and then a Walsh spectrum W is found (102); and the index of at least one of a center alternation number Sc and an RMS alternation number Srms which are defined according to the Walsh spectrum W, and the variation factor K1 and kurtosis factor K2 of the spectrum distribution is calculated (103) and the feature of the signal to be analyzed is extracted from variation in the index.