Spectrum analysis and display method of time series data of living organism

摘要

Even when a time series data varies in a relatively short period of time as is in a series of signals issued from a living organism, it is possible for the present invention to have a doctor precisely grasp variations in amplitude of even a weak one of frequency components of the time series data. In order to decompose the time series data into a plurality of the frequency components according to the present invention, a set of band pass filters are prepared. The band pass filters have their cut-off frequencies shifted or offset from each other by their passing band widths, respectively. The individual band pass filters process the time series data to produce such frequency components. These frequency components are then sampled in amplitude at predetermined time intervals. The thus sampled amplitudes of the frequency components are transformed into corresponding densities of a predetermined color including a gray color according to a predetermined color scale or a predetermined gray scale, and then displayed on a display screen on the basis of a time base of the display screen.